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The simplest way I have found to detect if the .NET Framework has been installed or not is to check for the existence of the registry key "HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework." You can find out what versions have been installed by enumerating the keys under the sub-key "policy." However, you are somewhat out of luck using NT4 for ASP.NET since, according to Microsoft: "ASP.NET Web applications and XML Web services can only be hosted on Windows XP Professional, Windows 2000, and Windows Server 2003." (see full details). Sorry!
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