UO Second Age

I just downloaded Windows 7 (fast as hell love it!) but every since, my client keeps crashing! I re-installed client from the website, but still crashes! Any ideas?:

Problem signature:
Problem Event Name: APPCRASH
Application Name: client.exe
Application Version: 5.0.8.3
Application Timestamp: 46004869
Fault Module Name: ntdll.dll
Fault Module Version: 6.1.7600.16385
Fault Module Timestamp: 4a5bdb3b
Exception Code: c0000005
Exception Offset: 00038c39
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 706b
Additional Information 2: 706be7c4432a593cb30902e5f84c11ff
Additional Information 3: 1bc8
Additional Information 4: 1bc860d13f599ffe8177c719f45412f0

is your sound (music) on?

I have the same problem. Music/Sound off.
The client freezes everytime I alt+tab, and sometimes it doesn't unfreeze.

Try disabling visual themes and desktop composition in the Compatibility Tab of your shortcut to Razor and UO.