I have what looks to be the same issue as reported in earlier threads like this one: http://social.msdn.microsoft.com/Forums/en-US/netfxsetup/thread/58ff584d-e849-49e7-8c17-563296602017
If I use the .NET Framework Setup Verification Tool, it reports .Net 4.0 is indeed failed.
The log for both Client and Full shows the following failures:
***WARNING*** File C:\Windows\Microsoft.NET\Framework\sbscmp20_mscorlib.dll is not installed on the system
***WARNING*** File C:\Windows\Microsoft.NET\Framework\v4.0.30319\WPF\wpftxt_v0400.dll is not installed on the system
***WARNING*** File C:\Windows\Microsoft.NET\Framework64\v4.0.30319\WPF\WPFFontCache_v0400.exe is not installed on the system
***WARNING*** File C:\Windows\Microsoft.NET\Framework64\v4.0.30319\WPF\wpftxt_v0400.dll is not installed on the system
Steps already taken to troubleshoot this include fully uninstalling .NET 4.0 and reinstalling (both client and full); reinstalling .NET 4.0 over itself with a repair install; installing .NET 4.0 full over a client install; and I have even fully reinstalled
Windows and started with a clean install. In all cases the same issue occurs. I've also run full disk scans etc., and my system is fully up to date with Windows Updates.
No .NET 4.0 app will run, but a few .NET 3.5 (or earlier) apps will. Additionally, a few desktop gadgets using .NET are broken if I have 4.0 installed.
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