A while back my laptop was attacked by the Windows Security 2012 virus and nearly knocked out my whole system. The fix worked really well for about 2 weeks and then it crashed. It now can only startup with the recovery disk. Although, I now must hold the shift key down when starting up and about every 3rd time it's asking for my smartcard reader. Since I don't know what that means and why it's asking for it , it then just goes into dos and ask for the f10 setup key which actually does nothing but makes the screen go black.
1. Back up all important Data using any data recovery program like Parted Magic - You can boot from CD (no install required)
2. Restore factory settings (if there's a provision for that)
3. If system can't be restored, try to clean with Anti Virus
4. Else, Format HDD and reinstall windows
Personally, I would go for format and clean install.