Last week I got a legal copy of Win 7 Pro x64. I have used Win 7 beta, RC1 and RTM Ultimate (Pirated) x64 and I didn't have the problem there.
The problem is: Every time I shut down the computer my Windows Media Player library is gone. When I boot up again I have to wait for Windwos Media Player to add all my media again before using it, and since I've got 50GB of music i takes some time :P
Someone know a sollution?