How can I verify if the .NET Framework has been installed?

Two ways:
1. check the Windows Registry for
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\InstallRoot
2. check for a local directory like
%windir%\Microsoft.NET\Framework\
where is
v1.1.4322 - for .NET Framework v1.1
v1.0.3705 - for .NET Framework v1.0

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