I've been trying to install the latest service pack 4 and
security patches on three Windows 2000 PC's. However, I
can't install SP4 because I keep getting an error
that "tftp.exe is open or in use by another program".

Also to add to the list of weird behavior that these PC's
are exhibiting, when I'm logged on as Administrator I am
denied access to Admin Tools, I can't open a Command
prompt or an mmc Console?

All things point to a virus, but which one? If anyone has
any advice I would appreciate it.

Thanks.

You may want to download STINGER.EXE from the McAfee
website at www.nai.com