Before anyone hates on me I HAVE TRIED all the suggestions on this forum and nothing seems to work for me. I just bought this new PC and installed the 50+ updates that come with getting a new PC and checked all drivers. I go install programs like xsplit and sony vegas and it says i need to DL 3.5. Co I click it and i get an 0x800F0922 error/ I have tried the DISM and tried downloading directly from the site. I need these programs! please help. Here is my entire cmd log while I was doing it so you can see what I possibly did wrong. just look at the end I even tried moving the "sxs" folder from my system disc to the HD, and nothing.

Microsoft Windows [Version 6.2.9200]
(c) 2012 Microsoft Corporation. All rights reserved.

C:\Windows\system32>dism /online /enable-feature /featurename:netfx3 limitaccess
 /source:c:\windows\system32\sxs

Error: 87

DISM doesn't recognize the command-line option "limitaccess".
For more information, refer to the help by running DISM.exe /?.

The DISM log file can be found at C:\Windows\Logs\DISM\dism.log

C:\Windows\system32>dism /online /enable-feature /featurename:netfx3 /limitacces
s /source:c:\windows\system32\sxs

Deployment Image Servicing and Management tool
Version: 6.2.9200.16384

Image Version: 6.2.9200.16384

Enabling feature(s)
[==========================100.0%==========================]

Error: 0x800f0922

DISM failed. No operation was performed.
For more information, review the log file.

The DISM log file can be found at C:\Windows\Logs\DISM\dism.log

C:\Windows\system32>

if you are running into this problem just reinstall windows 8 EVEN IF IT IS PREINSTALLED. Use your recovery disc and it will be fine. I just bought my PC and didnt think I had too. but it looks like this system was upgraded from another OS. So try it first.

Open the Control Panel > Programs and Features > Turn Windows Features on or off and place a dot next to .NET Framework 3.5 and then click OK.

your command is wrong. The files are not in c:\windows\system32\sxs. They are on the DVD under sources\sxs. So use this command:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs

Here are 2 articles for you:

Installing the .NET Framework 3.5 on Windows 8

http://msdn.microsoft.com/en-us/library/hh506443.aspx

Error codes when you try to install the .NET Framework 3.5 in Windows 8

https://support.microsoft.com/kb/2734782/en-us

Hello

This is what I did for windows server 2012, hope it will work the same for you in windows 8

1) Make sure that you have access to the windows 8 ISO, that you can browse till the source directory

2) Capture the ISO in the D drive if possible (or any other drive just mention it in the PowerShell command below)

3) Run the following PowerShell command 

dism.exe /online /enable-feature /all /featurename:NetFX3 /Source:D:\sources\sxs

4) wait until the message operation completed successfully show up then restart your machine

Note: as you can see /all is set in bold, it is important to have it, as it would install any parent feature required by the NetFX3

Thanks

HI

I tried to install the NEt framwork 3,5. First of all I really dont understand why Microsoft is not by default installing it form the beggining???

Second: I tried to turn on windows features and also to run the dism.exe/online/..etc command line but with no success.

The system report: Error 740- Elevated permisssions are required to run DISM.

I logged in with administrator privileges so I simply dont understand windows anymore.