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Originally posted by Hefficide
There has been a rash / plague of rogue antivirus activity on the web in the last few months. Some information regarding that can be found here. These are insidious little programs that infect your system and sit idle - attacking at a later time (based upon any number of trigger mechanisms).
It sounds to me like you may be experiencing this problem. Here are some resources:
An overview "How To".
All of the above have links to free of charge versions that work very well.
There are many members here, on ATS, who are very skilled at helping and are usually quite happy to do so. You'll probably have to devote a couple of hours to clearing this up - and will probably need to start your system in safe mode. If you are tech savvy, this won't be an issue at all. If not, please be honest with those helping you, let them know exactly what you are familiar with, and what you are not. They will walk you through it all very patiently - and they've helped many members fix these types of issues lately.