Chances are you're seeing the effects of another hijackware infection, possibly compounded by a W32/Alureon-variant rootkit infection!
OPTION A: Residents of North America (US & CA), the UK (and perhaps other regions now) may obtainMicrosoft-sponsored
Premium (i.e., paid) Support via the Answer Desk =>
http://answerdesk.microsoftstore.com [2]
OPTION B (Recommended): See...
• Cleaning a Compromised System
http://technet.microsoft.com/en-us/library/cc700813.aspx
Then see the (my) ANSWER post in this thread and follow those instructions (to-the-letter &
in order this time around!) to return your computer to a secure & functional state:
http://answers.microsoft.com/thread/c44429fb-3f7c-4646-8529-5a97bb3cd0eb
If you need additional assistance with the clean install, you can begin your own, new thread in this forum:
http://answers.microsoft.com/en-us/windows/forum/windows_vista-system
If these procedures are outside of your technical "comfort zone" - and there is no shame in admitting this isn't your cup of tea - take the computer to a local, reputable and
independent (i.e., not a "BigBoxStore" or the Geek Squad!) computer repair shop & let them do the work.
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Note: The computer should NOT be connected to the internet or any local networks (i.e., other computers) in its current state. All of your personal data (e.g., online banking & credit-card passwords) should be considered at-risk, if not
already compromised. Chances are Microsoft Security Essentials it not installed
or working properly!
Wish I'd had better news for you. Good luck!
Since I have nothing further to add to this discussion, I will no longer be monitoring this thread.
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[1] $99.00 USD for "up to 2 hours" of remote support; paid up-front & no guarantees whatsoever!