Hackers are always try to get into computers of other persons. It can be something as simple as phising confidential information ( like bank account numbers or credit card ) to complex hacking routines that use your computer as a repository for illegal content (like movies or music with copyright).

Unfortunately there is no magic or any software to prevent hackers directly   and it will never exist in future. It doesn’t matter how much money or resources we invest to design the perfect system, somebody will always try to find the way to crack it. Even the biggest government agencies like NASA, CIA and NSA have been victims of hackers but they can’t do anything and the same thing happens in the private sector with companies like Citigroup or Wal-Mart and many more.

The first thing we have to take care that in computer hacking prevention is to assure yourself that all your software is up to date, especially our operating system and our web browser.  Because they are the two things that hackers will try to attack first if they want to get into your computer.

The second thing that we need to do is to install a firewall. Internet firewall hacker protection has become so necessary that Microsoft now ships it for free as part of their Windows XP operating system to protect our pc.

At the end, there should be the anti-spyware program. As if viruses were not enough, companies from around the world decided to create programs that could pick up data from your computer in order to acquire information for their databases. It may not be as dangerous as a virus, but it is an intrusion to your privacy. Wipe them out with this piece of software.

Keyboard Activity Monitoring Tool is a hidden inspection utility that keeps track of all activities performed on your system in your absence. keylogger will let you monitor whatever work is done by the people in the background.

Key logger will records every keystroke make by the user in every application and save it to a text document/files. All major anti-keylogger or spy tools can’t be major by any anti-virus softwares. It is easy to use key catcher software helps you to watch your co-workers  are doing online, students are doing at lab,school and at home. So by using this software you can easily customize keyboard activity in the manner you want.

Features of keylogger software:

• Very easy to use
• Can work in invisible/hidden mode
• Invisible in window explorer
• Small size and low system requirements
• Capable of removing programme shortcuts from start menu.
• Capable of removing itself from uninstall list.

Before you think to create a backup, you have to arrange your files in an order. It doesn’t mean that you have to arrange each and every file in a different folder. You only make sure that all the essential data files are stored in one easy to find location.

People who use their computer occasionally (7 hours/week or less) should be backing up their data on at least a weekly basis. If you use your computer more frequently, however (more than 12 hours/week), doing it daily is probably a great idea.

How to Backup:

You can set up automatic backups or manually back up your files at any time whenever you want,for that you have to pass through the following steps:

1. Clicking the start button

2.Clicking the control panel

3.Clicking System and Maintenance, and then clicking Backup and Restore.

Notes:

• Never back up your files to the same hard disk that Windows is installed on.
• Always try to store media which is  used for backups (external hard disks, DVDs, or CDs) in a secure place to prevent unauthorized people from having access to your files.

A dynamic link library (DLL) is a collection of small programs, which can be called upon when needed by the executable program (EXE) that is running.

The Compiled library files are  containing a set of  drivers and/or procedures that are referenced and executed by a program that allows multiple programs to access shared system functions through common libraries and It may be dynamically linked into a program at runtime.

Most of the  DLL files are provided with the Windows operating system, and others are included by Windows programs and they allow various program functions, such as communication with external devices and hard disk input and output and it can be referenced by Mac cross-platform applications.

An example : If the program (exe) needs to get the free space of your hard drive. It can call the DLL file that contains the function with parameters and a call function. The DLL will then tell the executable the free space. This allows the executable to be smaller in size and  haven’t to write the function that has already exists.

COMDLG32.DLL

It controls the dialog boxes.

GDI32.DLL

It contains numerous functions for displaying text, managing fonts and drawing graphics.

KERNEL32.DLL

It contains hundreds of functions for the memory management and various processes.

USER32.DLL

It contains numerous user interface functions. It involved in the creation of program windows and their interactions with each other.

NOTE: The contents of a DLL file may cause errors within the program that references the file when deleting or modifying; for this reason, DLL files generally should not be opened or edited.

A hidden directory or hidden file on a computer is a directory (folder) or file which a user can’t see by default. The Hidden directories/files are  most often serve to hide important operating system-related files and user preferences.

Showing hidden files  is not a big task—for example, If we want  to delete everything from a floppy disk and the disk properties still indicate 100K of disk space which is  used by hidden files.

To see hidden files:

Note :To access Windows Explorer, click Start, point to All Programs, and then click Windows Explorer.

This is one of the most commonly asked questions on many video and audio forums. Many want to know how to combine video and audio footage, or combine multiple video files together.

The great thing is that the process of doing this is not that hard. You just have to have the right software and a little bit of time. I am going to go over four of the most popular software titles for combining multiple media files below.

Mediajoin

Are you looking for a solution that allows you to combine your video and audio files together quickly and easily? Mediajoin is a great piece of software that allows you to combine MP3, OGG, WAV, and WMA audio files with AVI, MPEG and WMV video files. This software is free, but unavailable for download from the developers website. If you look around on other download sites, though, you should be able to find it.

Combimovie

Are you just looking to combine a few video media files for a one-time project? Are you looking for something free? If so, then Combimovie is for you. Combimovie allows you to combine multiple mpg/mpeg videos into one big file. This is freeware, so you will not have to pay any money to do this.

Windows Movie Maker

This is a basic program that comes with Windows XP. It allows you to combine WMV files and make them into one large file. It is pretty basic and isn’t very effective in working with other file formats, but it is free with your operating system and can be of some use.

Easy Video Joiner

Easy Video Joiner is the only one of these programs you will have to pay for. It is for good reason, though. Easy video joiner has support for many different file formats the others do now offer. This is a good program if you are combining videos on a daily basis, but if you are just an occasional user, this is overkill. If you want to combine media files together, all you need is a simple piece of software nothing else.

All of the above applications make it easy for you to combine different media file types.

Not every movie file on the Internet has the same file type. Windows Media files are different than QuickTime movies, which are not the same as Real media files. Each format has specific uses and run through specific programs. Here are some of the most common movie file types you will find on the Internet.

Windows Media File

Windows Media video files (or .wmv) are one of the most popular movie file types on the Internet. They are played in the standard Windows Media Player that comes with all Windows computers.

QuickTime Movie

The QuickTime movie format (or .mov) is Apples equivalent to Windows Media Video files. It is very popular because this proprietary video format can be played on both Mac and Windows computers. .mov files are played by apples QuickTime player.

Real Media file

Real media files (or .rm) are files that can be completely downloaded before playing, or can be streamed directly from the Internet. These files can contain audio data, video data, or both. Real media files are
played on the Realnetwork’s Real Player.

MPEG

Moving Pictures Expert Group (or .mpg) files contain compressed audio and video data. MPEG files can be played on either QuickTime or Windows Media Player.

DIVX

DIVx files are high quality compressed movie files. It allows videos to be a lot smaller data-wise while still delivering crystal clear video. There are quite a few different programs that will play these files, but
DIVx does offer a downloadable program that will play these files.

SWF

SWF files are animation files that are created by Adobe Flash. They can contain audio and visual imagery, but instead of movies, the visual components are usually vector images. SWF files are vey popular in web
design and advertising applications. Any web browser with the downloadable flash player plugin can view these files.

What if you are trying to play a video file that is not listed above?

If you have a video file that you would like to play, but is not in one of the above formats, you are going to have to do some extra research to find the correct player or codec. If you type the file extension into
almost any search engine, many results will pop up and give you information on the necessary software needed to execute your given file type.

Many times, when you are running a virus checker on a windows machine, a file called csrss.exe will pop up and the end prompt and show that it is infected. You don’t really know what this file does, or if you need it.
It looks like a Trojan or a virus. You say to yourself “I don’t need this file. All it does is cause problems. I am going to delete it!” STOP!

The csrss.exe file is stored in the c:\windows\system32 folder. It is a critical system process that will cause very big problems if removed. Don’t even try removing it from the task manger. It will still cause operational problems in your operating system. Don’t touch it.

Now, this is a critical system file, but it is easily infected by spy ware and trojans. That’s why it is always showing up in your virus checker. It is best to let your antivirus program deal with this and not worry about it.
There are rare cases when this file will become corrupted. One of the ways you can find out if this file is corrupted is by simply opening your task manager. If it is using over 95% of your CPU or another abnormally high amount, there is a good chance this is the problem.

Don’t worry, though, this problem is easily fixed. This problem is related to a corrupt windows profile. Here is an easy way to remedy this problem.

1. Backup all necessary files in the profiles “My Documents” folder.
2. Log out of the account and log in (or create) another windows account
3. Click “My Computer”, then “Properties”
4. In the window that pops up, click “Advanced”
5. Click the settings button under “User Profiles”
6. Highlight the name of the profile you are having problems with and delete it!

Once you have completed this whole process, you can recreate your windows profile and replace the my documents folder.

The csrss.exe file is an essential operating system file. Tampering with it if you don’t know what you are doing can create some major problems. Let your antivirus program deal with it.

Most of the files that you delete are send to the Recycling bin. This helps you to recover files that you delete by mistake. On the other hand there are different files that are not send to the Recycling bin but are instantly deleted, so that you can not recover them from the Recycle bin.

If you delete a program through the “Add or remove programs” option in the Control panel or just uninstall a program, then all the files that will be deleted won't be send to the Recycling bin.

When you delete files in the MS-DOS prompt then they are instantly deleted and not copied to the recycling bin because the recycling bin is not a MS-DOS program.

You also won't be able to recover files from the Recycling bin if you delete them from a floppy disk or a USB key or any other removable drive. The Recycling bin is connected only to the hard drives on your computer and so does not store any of the files that you delete from other drives, so you need to be really sure when you delete files from such drives.The same goes for files that you delete from a network drive, so if you work on a home network take caution when you delete files.

The last kind of files that are not send to the Recycling bin are really big files. The Recycling bin has a set size. This means that the recycling bin will not get bigger than the allocated disk space. If the file is bigger than the set size of the recycling bin then Windows will alert you that the file will be instantly deleted and you will not be able to recover it. You can change the allocated disk size for the recycling bin if you right click on the recycling bin and click on “properties”. Now you can set the size of the bin as a percentage of the size of your disk(s). The default percentage is 10%, but if you often delete files that are bigger than this and you would like them to be send to the recycling bin, then you should change the size, but do not make it too big, because you will loose the empty space on your disk.

So, you have deleted a file that you would still need? It is not such a big problem as it looks like because there are several ways to recover your deleted file. Before we tell you how, let us tell you why you can do this.

The deleting process that is used by Windows and most other operating systems is not really a deleting process. The file is not deleted from the disk, but the computer is just told, that the file is not there any more. It is just like if you would delete an entry from your DVD database. You would not be able to find it any more but the DVD would still be just where it was. Until you would change it for something else. And the same goes for the computer. If the file was not overwritten, then you can still recover it.

But before you do that, you should go and check your Recycle Bin. Most of the files, that you delete are just copied into the Recycle Bin. Until you do not empty your Recycle Bin, you can always recover the file. Just open the Recycle Bin (you will find it on the desktop or in your Windows explorer), scroll down to the file that you would like to recover and right click on it. Now click “recover” and the file will appear in the directory where it was located before you have deleted it.

If your file is not in the Recycle Bin any more, then you will need a file recovery software, that will look for your file. There are several programs out there that you can download and use for file recovery. Some of them are “PC Inspector File Recover”, “Restoration”, “Undelete Plus” or “FreeUndelete”. Use any of this software and if the file that you would like to recover has not been overwritten, they will recover it for you.

If none of this helps, you can take your computer to a file recovery company near you. They use sophisticated programs that can recover files that you can not.