UPDATE: Dec 2016 – While the process below works very well, you can eliminate future .NET install problems by installing FEATURES ON DEMAND on your companies WSUS server.
If you are unable to install .NET 3.5 on Windows 8 or 8.1 and end up with errors like 0x800F0906 and 0x800F081F you will find that errors relate to corrupt or limited access to the source files. In ALL of the times I have tried to get around this, the source has NOT been the issue.
Often you can just install .NET 3.5 by bringing up a CMD window (don’t forget to right click and RUN AS ADMININISTRATOR) and then type either:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:<drive>:\sources\sxs /LimitAccessor
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All
In my most recent situation I would then error out with 0x800F081F and the logs would show:
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed finalizing changes. – CDISMPackageManager::Internal_Finalize(hr:0x800f081f)
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 The source files could not be found; their location must be specified using the /source option to restore the feature. – GetCbsErrorMsg
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed processing package changes with session options – CDISMPackageManager::ProcessChangesWithOptions(hr:0x800f081f)
2014-09-10 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed ProcessChanges. – CPackageManagerCLIHandler::Private_ProcessFeatureChange(hr:0x800f081f)
2014-0910 19:07:54, Error DISM DISM Package Manager: PID=5116 TID=4028 Failed while processing command enable-feature. – CPackageManagerCLIHandler::ExecuteCmdLine(hr:0x800f081f)
If this is your case, then .NET may have been patched on your machine… but wait, you say, it is not installed so how could it be patched… that is a good question. If you look at your WINDOWS UPDATES > HISTORY, you may see some .NET 3.5 patches that have been installed. If that is the case go to PROGRAMS AND FEATURES > VIEW INSTALLED UPDATES (from the menu on the top left) and find them by KB number. Note that I have found the names of the patches Windows Update History do NOT match what is in INSTALLED UPDATES… go figure.
Specifically I suggest you look for (and uninstall) KB2966826 & KB2966828 . In my most recent case I only found KB2966828 but after I uninstalled it and rebooted (yes, the reboot was necessary) I could install .NEt3.5 on my Win8 PC.
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thank you dear!
I have KB2966826 installed on my surface pro 3 right out of the box and Windows will not allow me to uninstall it. This is preventing me from installing .Net 3.5. The Microsoft knowledgebase is not very helpful and I need to get this resolved. Any ideas?
For all who are in a company environment that uses active directory policies and WSUS you must move your computer out of the OU its in , and place it in the computers Container. after doing so , go to cmd and type gpupdate /force and then reboot and then it will work GUARANTEED.
I would not want to Guarantee that answer as there are several causes for this problem, but I hope your solution helps someone so we will post it :) Thanks for your comments.
Thank you my dear friend i spent 4 days bashing my head how to solve it and finaly you helped me!!!Keep up the good work and stay awesome! :D
Thanks for the quick tip Ian. Hat off to you.
This solution defies all logic but that's MS for ya. Btw, it did solve my (very frustrating) problem, thanks!
THANK YOU!!!!!!!!!!!!!!!!!!!!!!
I thank you very much worked to perfection
I have Win 8.1 Pro. Update History shows KB2966828 install succeeded with the date, but in Uninstall an update it is not listed. Please help me to get this removed? I urgently need the .net 3.5
thanks you boss