Rough week with two computers getting hung up when starting AC and requiring several uninstall/reinstalls. Last time this happened was after a windows security update; there was a windows security update this week but problem seems to be recurrent. I have already made AC an "exception" in windows security settings. Haven't yet tried an install/uninstall on my main computer yet. Using 6.3.3 on Windows 7. Anybody else having this problem? Any ideas?