>A program I was testing has replaced a few system files (winsock.dll, wsock32.dll and icmp.dll) in the SYSTEM32 directory. It's own uninstall program does not seem to have put them back.
>
>I have no trouble expanding the original files from my NT Server CD, but I cannot seem to replace them - they're probably being held open by the server.
>
>Unfortunately, we have the server on NTFS - so I cannot boot to DOS to simply expand and copy the original files.
>
>So - how do I manage to fix these files?

Rerun NT's install from the 3 disk set, and select the Repair option when prompted. It will allow you to selectively repair and replace files without actually performing a complete reinstall.

If you don't have the 3 disk set, you can recreate them on another system by running WINNT.EXE (from Win3.x, Win95 or Win98) or WINNT32.EXE (from NT Server or NT Workstation) with the /ox command line option.

>
>TIA