Maybe you’ve had the same problem I've had. You double-click an MSI only to be greeted by the a crash dialog, asking you to send information to Microsoft. Well a solution was posted today, here is the info if you missed it:
Solve a problem with Windows 7 beta
An issue with the Customer Experience Improvement Program (CEIP) client in Windows 7 beta is causing Explorer and some MSI-based installers to stop working properly.
To solve this problem, follow these steps:
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Click the Start button 
, click All Programs, and then click Accessories.
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Right-click Command Prompt, and then click Run as administrator. 
In the User Account Control window, verify that Program name is Windows Command Processor, and then click Yes.
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In the Administrator: Command Prompt window, type or paste the following text at the prompt:
reg delete HKLM\SOFTWARE\Microsoft\SQMClient\Windows\DisabledSessions /va /f
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Press Enter to install the solution.
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If The operation completed successfully displays, close the Administrator: Command Prompt window to complete this procedure. If "ERROR: Access is denied" displays, repeat this procedure from the top, making sure you clicked Run as administrator in step two.
Update, Paul Thurrott’s site has more information. This will teach me for publishing an article without Googling first.
http://community.winsupersite.com/blogs/paul/archive/2009/01/19/sqm-bug-in-windows-7-something-is-wrong.aspx
Cheers!
Chris