As for Windows 7, the .NET Framework 3.5.1 is included as system component.
To install/uninstall the .NET Framework 3.5 SP!, you can go to Start menu -> Control Panel -> Programs -> Turn Windows features on or off, unselect the checkbox of the Microsoft .NET Framework 3.5.1, click OK. Then open it again, and select the checkbox this time, click OK.
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If there are any problems occur during the installation, you can collect the installation log files and analyze them.
You can follow the steps below to collect the log files:
· Try to clean your "%temp%" folder (Start Menu >> Run >> Type "%temp%).
· Install .NET Framework 3.5 SP1 again.
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