Apparently Windows Millennium Edition's System Restore feature is causing problems for people who catch viruses, because it keeps putting back the viruses cleaned out by their virus software.

According to an email sent to me, the correct thing to do if this is happening to you is to shut off System Restore in your Control Panels\System\Troubleshooting\Disable System Restore, then reboot and virus-check, then switch System Restore back on.

Of course, you should also check any zip disk backups and so on.