My friend recently downloaded a virus infected file and then after 5 minutes the pc restarted itself. Then the view was stretched and then this just cycled on. Left the computer for about half a day, booted the computer and came up with blue screen. Didn't catch the technical info, but got the error code. The code is C0000218. Then i created a recovery disc, but that didn't work now I have another error message "Invalid Serial Number"!!! Now when I make changes to the BIOS it doesn't save!