Hi KumarThrainderMIND-0302,
First, .NET Framework requires administrator privileges for installation.
And on Windows 7 systems, .NET Framework requires Windows 7 SP1. If you're on Windows 7 and haven't yet installed Service Pack 1, you need to do so before installing the .NET Framework.
For more details about the system requirements of .NET Framework, please refer to this document.
.NET Framework system requirements
You can follow this document for more help.
Best Regards,
Daniel Zhang
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