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I am unable to install the .NET Framework 3.5 on my Windows 10 box. I tried:

  • enabling it through Programs and Features.
  • enabling and installing through DISM.
  • SFC /scannow

No success. Mostly I get error code 0x800736B3 saying, "The referenced assembly is not installed on your system". Sometimes I get Error 14003. I obviously need .NET due to many apps needing it to run. This is a brand new system. What should I try next?

  • Seems to be required. A lot of apps need it and start the installer. – prl77 Aug 22 '15 at 7:12
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Please proceed with caution as your results may vary: Look for .Net Cleanup Utility.

I will be honest, have not used under Windows 10. However, I have had good luck with this application cleaning up old traces of .Net, so you can start afresh with net .Net Install(s).

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Thanks guys. After continually running into various issues with Windows 10, I went back to Windows 7 since I don't feel that 10 is ready yet for prime time.

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Go to Programs and Features in the Control Panel, then click on "Turn Windows features on or off". In the Windows Features dialog, just check the box for .NET Framework 3.5.

  • I found out that it's more tricky in the Fall Creators Update. If that's your version, then do this: insert (or mount) the installation disc, and then enter this command in an elevated command prompt: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (assuming D: is the drive where the installation media is). – Charles Burge Dec 21 '17 at 17:23

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