Are you unable to install programs on your Windows 7 beta? You're probably a victim of this MSI installer bug, which you can actually fix by yourself, right now, without waiting for a Microsoft patch.
Here's what you do.
1. Open a Command Prompt as Administrator
reg delete HKLM\SOFTWARE\Microsoft\SQMClient\Windows\DisabledSessions /va /fand press enter.
That's it. To open command prompt as an admin, you'll have to set the User Account Control slider to the lowest setting (Never notify), then reboot.
After that, your MSI applications should install like normal. Coincidentally enough, even Office updates can't install when you're hit by this bug, since they're MSI-based. [Chris123NT via ZDNet]