I'm using almost the identical system as JohnnyRay, and while I've had problems, it doesn't seem to be AMD or XP related. Most of them have been reported here by users with other types of machines. P5 is processor and memory intensive. I think there may be problems with the program itself on how it uses and releases memory. However, that said, I get more out of P5 than I ever did out of P4 or P2 (I skipped P3). I love the hair and setup rooms. Sure, hair is slow, but it can look really good when you finally get it right. Setup gives me the ability to use all those static models I've downloaded or wanted to download, and make pretty darn good characters. I've found enough of the bugs now to know what to avoid, and how to do my own work arounds, so my freezing/crashing problems have mostly gone away. I AM looking forward to the first bug fix update. I sort of hope that CL is doing them in parts, so we don't have to wait for everything we've reported a problem on to get a fix for what they've already finished.