Sounds like kwbot.worm.
This VB Script will the common Registry entries and files created by the KWBot.Worm. This worm causes an error message that "CMD32.EXE" cannot be found on startup. The error message may also be that "system32.exe" cannot be found.
Read how to get rid of it
here.
Next time, it's important you tell us what version of windows you are running.