I downloaded this file many times from files.avast.com (all, time by time, from beta to release - same reaction). Those file, that I've downloaded today don't work on my main computer, but work on netbook ASUS very good. Something wrong with programmes/settings on my computer, not with installator. And i want understand what. I think that reinstalling of Win7 will solve this problem. But I have no problem with other products. I don't want reinstall Windows cause of AVAST. 4.8 is still supported, I have time to find solves of problem.