The BSOD (Blue Screen Of Death) is in 99% of the cases a sure indicator of virus infection.
Before you think about a factory restore or Windows system re-installation, try this:
What most Windows computer users fail to understand is this:
Besides corrupting your Windows operating system files, the first thing a virus or other malware does, is to either disable or otherwise corrupt your antivirus or any other system protection software program. That is why most of the times you cannot safely, effectively and completely remove a virus infection in a Windows environment. Sometimes the infection is so bad that even your bootsector and master boot record (MBR) gets corrupted, and the computer won't even boot up into Windows anymore.
Most people panick, and either pay a lot of money to some idiot at the Best Buy Geek Squad to remove the infection and repair their Windows system, or they just wipe off everything (losing important personal data), and re-install Windows or do a factory restore.
WRONG: You should always try this first:
For a proper scan and removal of any virus, worm, trojan and any other malware, the best way is to use a System Rescue CD, like BitDefender or Kaspersky. Those are both bootable CDs, that run scans in a safe Linux environment, not corrupted by anything.
Go to a different, healthy, non-infected PC or laptop and download both the BitDefender and the Kaspersky Anti-virus Recovery CDs (free downloads).
Download links for both:
http://download.bitdefender.com/rescue_cd/
http://support.kaspersky.com/viruses/rescuedisk
Burn both downloaded iso files to CD with an iso burner software. If you do not have an iso burning software installed, I recommend getting the CDBurnerXP (free software) from here:
http://cdburnerxp.se/
Once you burned the recovery CDs, return to the infected computer and put the BitDefender Anti-virus Recovery CD in your CD/DVD drive and boot from CD (set your boot up options in BIOS to CD boot as first option if it does not boot from CD at first)
After your infected computer boots into the Recovery CD Linux environment, first update the virus definition database from the Internet server, than perform a complete scan of your desktop computer or laptop (all hard drives and/or partitions). Remove (delete) any infections found, and shut down your desktop computer or laptop.
Remove the BitDefender Anti-virus Recovery CD and insert the Kaspersky Anti-virus Recovery CD.
Repeat the same procedure as for BitDefender above.
After scanning with those 2 Anti-virus Recovery CDs, your system should be virus free, and will function properly again.
You might also need to do a master boot record (MBR) repair on your system, if your MBR also got corrupted.
Download the Windows 7 or Vista System Recovery Discs (according to what you got), $9.75 here:
http://neosmart.net/blog/2009/windows-7-system-repair-discs/
Burn the ISO to a CD, boot from it and repair your MBR.
Or, with a little computer knowledge, you can create your own System Recovery Disc from an existing installation of Windows, read here:
http://windows.microsoft.com/en-US/windows7/Create-a-system-repair-disc
Good luck.
Source(s):
Happy and worry free Linux user (the guys that usually create the viruses - lol). Also Windows fixer for other less fortunate people.