I have to agree that there is something seriously wrong with the current version. Not only did it stall Windows (7 - 64-bit) starting up, but if I did manage to start my computer, the RAM load shot up to almost 100% during bootup and stayed that way for some time or until I used a memory recovery tool. I tried unistalling, reinstalling, using the avast cleanup tool, etc, but nothing worked. I then tried Windows Live Essentials and had no problems with that. I have now put AVG Internet Security (Trial) on my PC and it's working great (much lower RAM usage than even when avast was working properly, ie. instead of about 75%, it's dropped to 35%). When I upgraded the program to the latest build on another PC in my home network, that refused to boot at all (I can't remember how I got it working again, but fortunately I did). Even though I've recently purchased a two-year, three PC licence, I'm now very tempted not to put avast back on my own PC again as everything is running better now than it has for quite a while and certainly since the latest version came out.