1. Dont know if you considered this, but just to have it said...
you need to boot up in safe mode with network drivers to download anything
2. Based on this, it could even be some graphic driver bug or whatever...
but since youve taken the virus path already, lets try this first...
download a bootable anti virus cd image like
burn the image to cd, boot from it, run a scan and check the result
3. Otherwise, if all the above didnt helped i suggest you to reinstall/renew your graphic
4. If all the above didnt helped, give some further information in your next post plz
the dreams of yesterday are the hopes of today and the reality of tomorrow.
-Robert H. Goddard