That's a common symptom of a virus. A common tactic is to rename
regedit.exe to regedit.com, but some newer viruses also prevent you from
doing that. In that case, you're best to try to identify the virus, then
use another machine to download a fix tool to diskette, write protect it,
and run it.
Also, you can try using an online virus scanner, like Trend Micro's:
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.