>Do you have a lot of video or avi files? I've heard of problems with avi and video files with Vista. Other than that typically hanging is a result of incompatible hardware or memory.
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I'm running Vista on my notebook (2 gig ram) and my wife's desktop. I love it. It's much faster than XP.

Greg, reformat and do a new install. There are all kinds of horror stories about upgrades from XP.