Press win r to open the run window, enter services.msc and press Enter to open the service window, as shown below:
Locate the windows update service and find that the windows update startup type is disabled, as shown in the following figure:
##Double-click windows update to open the windows update properties window , change the startup type to automatic, and then click Apply->Start. At this time, windows update has been started, as shown in the following figure:##Now open the Start->Control Panel->Uninstall a program->Enable or turn off Windows functions window, as shown below:
Check Select .net framework 3.5, and then follow the prompts to install it automatically, as shown in the figure below:
#Restart the computer and now find that .net3.5 has been installed normally.
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