Probably the safest thing to try first would be a restore point prior to the issue first occurring. This should get your registry values back to where they were at that point. Assuming that you have tried and exhausted this route. Then you may find this article helpful
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or perhaps this one
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I have noted that some people have reported success using one or the other of those two resources. Of course manually create a current restore point before attempting or applying any registry repairs or fixes.
Also consider following up what you've already been able to accomplish with Spyware Doctor by running
Spybot S&D as well as
MBAM , download, install, update signatures, boot into...