Hi Alimardani,
Thank you for your post.
To remove .NET Framework 3.5 SP1, you might try downloading
.NET Framework Cleanup Tool. It is the auto-tool that is designed to perform a set of steps to remove selected versions of the .NET Framework from a computer.
Hope this helps! If you have any concern, please feel free to let me know.
Best regards,
Yichun Chen
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