The ntdll.dll file

If you see this file on your computer, you should not be worried. This is one of the files that Windows needs to run. It is one of the system files that you should have on your computer, and you should not delete it.

Normally it is located in the c:\windows\system32 or c:\winnt\system32 directory and can also be found in the c:\i386 directory. It has a description as a „NT Layer DLL“ and it contains NT kernel functions.

This file is not a security threat to your computer. Anyway a virus or a trojan can infect different files, so you should use an anti virus program to scan your computer. Even if the anti virus finds a virus within this file, you should not delete it but you should disinfect it, because your Windows system will need it. If you have an anti virus software installed on your computer, that regulary checks all the programs that you install and all the internet sites that you visit, you should not get such problems at all. Regular anti virus check should be scheduled.

There are users, that experience some errors in Internet Explorer, but this is not an effect of the file but this happens because of other add ins, also called plug ins. These are small programs, that you can install manually and they change your Internet Explorer. So if you experience such problems try to deinstall the last add in that you installed and the problems should go away.

If you still have problems, then you should consider downloading the file from the internet and replace the original file, but you should only do that if you are really sure, that you know what you are doing.