I have noticed this a lot too. The memory error doens't seem to affect anything but Attac locking up causes some problems sometimes. the exact problem once in a while when you are tryying to do things manually the program will lock up and the only way to get out of it is to end an unresponsive program. I am using XP media edition and I have noticed it on my laptop when I try to play from that comp- that it does it too and that machine is running XP pro. Jsut so you know what platforms it is happening on