Cannot install .NET 4 framework on Windows 2008 R2 server

We cannot install .NET 4 framework on a Windows 2008 R2 server.  The following is a snipet from the log file:

Log File C:\Users\tturney\AppData\Local\Temp\2\Microsoft .NET Framework 4 Setup_20111228_143038946-MSI_netfx_Core_x64.msi.txt does not yet exist but may do at Watson upload time
 Calling MsiInstallProduct(D:\ac32f3b0d81b08a1fdde54b716\netfx_Core_x64.msi, EXTUI=1
 Returning IDOK. INSTALLMESSAGE_ERROR [Service 'Microsoft .NET Framework NGEN v2.0.50727_X86' (clr_optimization_v2.0.50727_32) could not be stopped. Verify that you have sufficient privileges to stop system services.]
 MSI (D:\ac32f3b0d81b08a1fdde54b716\netfx_Core_x64.msi) Installation failed. Msi Log: Microsoft .NET Framework 4 Setup_20111228_143038946-MSI_netfx_Core_x64.msi.txt
 PerformOperation returned 1603 (translates to HRESULT = 0x80070643)

Action complete
OnFailureBehavior for this item is to Rollback.

  It looks like it hangs on trying to stop the 'Microsoft .NET Framework NGEN v2.0.50727_X86' service, but the service is already stopped (and disabled).  I have been running the installed as administrator, what could be causing this issue?

Tom T.
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Uninstall all the .Net Framwork versions and then run this cleanup tool:
Then delete the Microsoft.NET folders in Program Files and Windows.
Run CCleaner and delete only the .NET registry leftovers.  Don't delete any Silverlight keys or you will have the same problems with it.
It's a pain but is the only way I've found that reliably fixes the problem.

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I see some conflicting .86 and .64's throughout that log.  Could you be trying to load a 32bit .net ontop of a 64bit or vice versa?
tturneyAuthor Commented:

  The Windows 2008 R2 servers we have all have those two services.  The information I found from MS is that on 32bit versions of Vista, 7 and 2008 only the 32bit version is installed.  For 64bit version, both are installed.
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tturneyAuthor Commented:

  I've download the tool and will try it tonight when people are off the system.  Thanks for the link.
Don't user CCleaner to delete any .NET keys when .NET is installed on the system or it will cause .NET updates to fail.  Only use it to cleanup after you run the other tool and delete the folders.  Good luck.
tturneyAuthor Commented:
Well I could not get the .NET 4 framework to install on the server.  The tool seemed to run like it should, but I still can't install .Net 4 framework.
Did you delete the 2 folders and run CCleaner after the tool?
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Windows Server 2008

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