|Try downloading Hitman Pro and or Malware Bytes.|
Hitman Pro: http://download.cnet.com/Hitman-Pro...
Malware Bytes: http://download.cnet.com/Malwarebyt...
Rename both files/and or which ever you choose to something like 1234.exe, so that the virus doesn't disable them, you can scan with Malware Bytes in safe mode (which is highly recommended), but you cannot scan with Hitman Pro 3.5. in safe mode.
If you cannot open any .exe files, this might fix the problem (try doing it in safe mode though)
: http://www.dougknox.com/xp/file_ass... (click on the one that says .exe)
Also, you could try downloading both^ those programs in Safe Mode with Networking, which might help.