.NET Framework setup verification tool and cleanup tools
To identify and clean-up issues related to the installation of the Microsoft .NET Framework:
A link to the tools can be found here: .NET Framework setup verification tool and cleanup tools
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First use the validation tool to establish if there is a problem with .NET or not.
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If there is, first try running a repair via the Windows > Control Panel > Programs and Features.
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Use the validation tool to check if the problem was fixed.
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If not, use the cleanup tool.