|First I suggest to download and burn an independently working antivirus cd image.|
Something like this:
Avira AntiVir Rescue System (iso)
Reboot your system from CDROM, update the virus library files, configure what to do on found viruses and start the scan process.
If you have any external drives (USB hard drive, USB stick a.s.o.), plug them to your computer, so that these drives will also be scanned for viruses.
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