If you've got a Windows 10 installation USB, plug it in and let's assume it's the E drive
Go to "E:\sources\sxs", a file in this location with name: "microsoft-windows-netfx3-ondemand-package.cab". It should be around 70mb in size
Copy and paste it into "C:\Windows", rename it as: NetFx3.cab
Run Command prompt as Administrator:
Start
Type "Command Prompt"
Click "Run as administrator"
Type the following command: dism /online /Enable-Feature /FeatureName:NetFx3 /Source:"%windir%" /LimitAccess
Press Enter and waiting for the installation finish (100%)
Reboot
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https://www.microsoft.com/en-us/download/details.aspx?id=5007