It would be worth a try to restore a registry backup dated Prior to the problem, 
for starters. 

Have you tried booting to Safe mode? You can restore a registry backup in Safe mode, 
see if that solves the problem. Oddly enough, it sometimes works and would be a whole 
lot easier, than the work you have ahead of you. 
How to Start Windows in Safe Mode

If you can get into Safe more: Go to Start - Run - type: SCANREGW /RESTORE 
then hit Enter. Choose a backup with a date prior to the problem. A good backup will 
have the word "Started" before it. Then try rebooting into Windows. 



Dealing with Unwanted Spyware and Parasites

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