There is a simpler fix to the problem, published by MS, that should appear automatically in the Action Center messages if you have reported the problem to MS. If not, here it is.....
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:
- Click the Start button Link Removed - Invalid URL, click All Programs, and then click Accessories.
- Right-click Command Prompt, and then click Run as administrator. Link Removed - Invalid URL In the User Account Control window, verify that Program name is Windows Command Processor, and then click Yes.
- 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 - Press Enter to install the solution.
- 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.
I can't verify that it works, because I used the fix from this thread before the above was released. But I assume it does because it looks like it achieves the same thing with a single command.