Windows 7 dev machine with/ - vs10 - iis7 - webmatrix - mvc3 rc2.
A mvc2 project using 3.5 was compiling but turned flaky with errors pointing at problems with the framework. Did an uninstall and reinstall. No joy. Add/Remove programs shows Framework 4 client profile; extended; and multi pargeting pack but none of the earlier frameworks.
running dotNetFx35setup.exe processes without errors and tells me to use 'Trun Windows features on or off'. Microsoft .NET Framework 3.5.1 is list with 2 nodes - Communication Foundation HTTP Activation and Foundation Non-HTTP Activation - both unselected and choosing either will report 'an error occurred' without more specifics listed anywhere including event viewer.
UPDATE: Repaired VS and problem is resolved.