Resolution:
How can I find out if Microsoft .NET is installed and also what version(s)?
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One way to do that is to look it up in the Windows registry in the following way:

   1. Go to Windows Start menu > Run > Type in "regedit" (without quotes) in the open field to open the Registry Editor.
   2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP
   3. The keys below this level should contain the version number(s) of Microsoft .NET that are installed - e.g. v1.1.4322
   4. To find out the service pack version, expand the key and look at the value of SP(e.g. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v1.1.4322\1033\SP). Example: for Microsoft .NET 1.1 Service Pack 1, the value of SP is 1.

How to check if and what Microsoft .NET versions are installed