i am using avast antivirus in windows 7 and came up with all the versions for an up gradation. to have a scan thoroughly, i made all the possible moves. but all the time when i tried the versions of my avast say for avast 4.8, 5 and also made use of 6, all of them appeared for me crashing all the way with "error extracting archive" when i was able to run them.
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