I had been experiencing a ton of errors on a set of laptop computers recently where the .NET 3.5 assistant and Silverlight were corrupted on install. The corruption prevented any kind of update or uninstall. After a few Google searches I came across these:
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Windows Installer CleanUp Utility
When you are working on your computer and installing a new program, the installation suddenly fails. Now you are left with a partly installed program. You try to install the program again, but you are unsuccessful. Or, maybe you have problems trying to remove an old program because the installation files are corrupted.
Do not worry. Windows Installer CleanUp Utility might be able to help. You can use the utility to remove installation information for programs that were installed by using Windows Installer. Be aware that Windows Installer CleanUp Utility will not remove the actual program from your computer. However, it will remove the installation files so that you can start the installation, upgrade, or uninstall over.
Description of the Windows Installer CleanUp Utility
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That solved the Silverlight problem.
This solved the .NET problem
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Automated cleanup tool to remove the .NET Framework 1.0, 1.1, 2.0, 3.0 and 3.5
I have posted an updated version of the .NET Framework cleanup tool that now contains support for automatically cleaning up the .NET Framework 1.0, the .NET Framework 1.1, the .NET Framework 2.0, the .NET Framework 3.0 and the .NET Framework 3.5.
This tool automates the manual cleanup steps for the .NET Framework 2.0 that I posted a while ago. These steps have helped solve most of the known .NET Framework 2.0 beta uninstall issues that I know of. In addition, the tool can be useful to return your system to a known (relatively clean) state in case you run into any .NET Framework 2.0 installation failures so that you can try to install again.
The updated version of the cleanup tool contains options to clean up the .NET Framework 1.0, 1.1, 2.0, 3.0 and 3.5 separately and all versions simultaneously in a single step. The cleanup tool contains logic so that if it is run on an OS version that includes the .NET Framework as an OS component, it will not offer the option to clean it up. This means that running the cleanup tool on Windows XP Media Center Edition or Tablet PC Edition will not offer the option to clean up the .NET Framework 1.0, running it on Windows Server 2003 will not offer the option to clean up the .NET Framework 1.1 and running it on Windows Vista will not offer the option to clean up the .NET Framework 2.0 or the .NET Framework 3.0.
Aaron Stebner's WebLog : Automated cleanup tool to remove the .NET Framework 1.0, 1.1, 2.0, 3.0 and 3.5
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