With Avast free AV program and Windows 7-64 bit installed, am finding that only Windows Internet Explorer will open. Attempting to open all other programs results in nothing happening (sometimes the ball icon spins for a second or so). This situation immediately follows routine weekly running of the recently updated Avast AV scan of C-drive which identified a trojan, located, maybe, in winsys64 which was sent to virus vault (though 1 of the 3 lines then said "file could not be located"), then did recommended boot scan resulting in mention of something about a CAB file, then Windows seemed to then open as usual. (Avast AV won't load so I can't check its scan logs for the specified items it identified.) As said, the only program I seem able to open now is Windows Internet Explorer. My usually used Firefox, MS Word, Adobe Acrobat, etc, do not open. All these programs, including Avast AV have worked fine for the past 5 months. Any advice/suggestions on how to proceed will be appreciated.
thanks,
Bob