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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?

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  • Seems to be required. A lot of apps need it and start the installer.
    – prl77
    Aug 22, 2015 at 7:12

3 Answers 3

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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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Did you try with the executable installation file from microsoft?

If the NetFX installation files are not under C:\sources\SxS on your installed system, or under /sources/WinSxS in your installation media, you will need to find and download the microsoft-windows-netfx3-ondemand-package.cab file from Microsoft if you can find it, or from another .iso file which you can downlaod through Media Creation Tool. You can then install it through DISM like this:

DISM.exe /Online /Add-Package /PackagePath:c:\KBnumber.cab

If this doesn't work, some people mention using these 2 commands - although I suspect you shouldn't need them if your Windows is freshly installed:

Dism /Online /Cleanup-Image /StartComponentCleanup
Dism /Online /Cleanup-Image /RestoreHealth
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  • This is a 5-year old thread. The issue existed when Windows 10 was freshly out and not yet compatible with other Microsoft products. This is no longer an active problem.
    – prl77
    Jan 6, 2021 at 23:10
  • I've had very similar problems not so long ago that I solved with what I mentioned above.
    – GChuf
    Jan 7, 2021 at 8:19
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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.

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  • 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). Dec 21, 2017 at 17:23

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