I just got the Windows 7 and it works great.
However, I have problems with Windows Live Messenger.
The installation goes fine but when I try to sign in I get the error code 80048820. I tried everything, from turning off the firewall to IE settings. Also, I tried Live Messenger 7.5 and 9.0. None of them works. It works on Vista and XP just fine so I guess it has to be something with the Windows 7. I have a Windows 7 Build 7000 version.