Why does VS 2008 sp1 install abort on Win7 RC?

Question

What can you do if you get the following error when installing Visual Studio 2008 sp1 in Windows 7 RC?

Operation Aborted

Answer 1

while installing Visual Studio 2008 SP1 on Windows 7 RC 7100, run this as administrator:

reg delete HKLM\SOFTWARE\Microsoft\SQMClient\Windows\DisabledSessions /va /f

Afterwards Visual Studio 2008 SP1 will install correctly.

I copied this from the original question, just to make it a proper question/answer... marked as community wiki