Windows XP error message, will not run anything

I have a dell optiplex p4@2.4Ghz/40gb hd/512mbRAM and everytime I start it up I get this message: Error loading C:\Windows\shoat.dll

Can anyone be of any help? I've never experienced this before. I cant run any programs, it just keeps popping up that error message.Thanks in advance for any advice.
 
you may have a virus that deleted that file, or simply the deletion is a result of corruption. Try finding the file on a trusted DLL replacement website, then register it with RUN (instructions are available elsewhere).

If that doesn't work run your recovery CD or DVD, provided by dell.
 
Back