I am trying to install 

I Mounted Windows 8 on D:

DISM /Online /Enable-Feature /Featurename:NetFX3 /Source:D:\sources\sxs /LimitAccess

I am getting this error 

 I've got an error number 0x800F081F

Here is my DISM log file

https://dl.dropbox.com/u/50664042/dism.log

The Source files could not be found

TroubleShooted using health

DISM /Online /Cleanup-Image /RestoreHealth

• Moved by David WoltersModerator Tuesday, May 21, 2013 1:56 PM Moving to a more appropriate forum

I did this process

Mounted this on D Drive

• Windows_8_Pro_RTM_FINAL_EN-US_x64.iso

• I Run

DISM /Online /Enable-Feature /Featurename:NetFX3 /Source:D:\sources\sxs /LimitAccess

this

command with admin privilages.

• got the error 14028

• Again Run with

DISM /Online /Enable-Feature /Featurename:NetFX3 /Source:D:\sources\sxs

(Removed /LimitedAccess in the end A solution from http://social.technet.microsoft.com/Forums/en-US/w8itprogeneral/thread/d7671c66-07d6-431e-85b6-d0a078d3ba35)

• got the same error 14028

• Again Run ( just added

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

then too I got the same error

• Now I run

  • DISM /Online /cleanup-image /Scanhealth

  • The above command is to check the

  • (Taking long time cancelled for now)

  • Run the command DISM /Online /cleanup-image /Scanhealth  again

    • this is taking too long time,I think it does not work

    • • • Please help 

• Edited by dupsay Saturday, March 23, 2013 4:40 PM tried formatting the text

I have the same problem. I spent several hours that would solve it. Why do all in MS so difficult for people?!

online update - not work

grouup policy - not work

not work

• Edited by Max Charp Saturday, April 20, 2013 1:09 PM

HI everyone!

if you people are facing the error code 14028 while installing netframe 3.5 in windows 8 and 8.1 then all you have to do is install 7-zip then extract the folder sources\sxs from the ISO file into a new created folder(eg:net35) in C drive. Then run cmd as administrator and type dism.exe /online /enable-feature /featurename:NetFX3 /all /Source:C:\net35\sxs\ /LimitAccess . Everything went well for me to treat Error: 14028, now try ur luck. 

• Edited by Anderson Boss Saturday, March 29, 2014 3:05 PM
• Proposed as answer by iivuch Friday, November 07, 2014 11:03 PM

I've burned a lot of daylight with this problem on different 2012 r2 servers.  I started coming across some other weird stuff in my installs from my ISO so I downloaded another and then got more weird stuff. Long story short, I ordered the media for our volume licensing. I copied the contents of SXS from the media to a temp folder on the server.  I have previously used this command (as administrator):  

Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess 

which worked on the last last server and windows 8 workstations flawlessly. I copied the Windows 8 SXS or used a DVD for the workstations but same command.

I didn't have any of the updates mentioned installed so nothing to uninstall there.

With the new media, I went back to adding Roles on the server and, in fine print at the bottom and in blue, I clicked on the link to specify an alternate source path.   It still failed.

This wouldn't be as frustrating if it didn't take so long to report the failure (or success) but just fuels the fire.

In summary - uninstall the updates mentioned, if they were installed. I did not have them installed.

Either run the command as administrator once the SXS files are copied or with the media in the drive, where D: is where the Sources\SXS folder is:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

Make sure you have a good copy of ISO or media DVD of the OS you are trying to install .net 3.5 from.

I ran the following 2 commands first as I was going to attempt connection straight to Microsoft Updates but thought I might be inviting more trouble - all our updates come from WSUS.  Can't say that they helped but these were the last 2 commands I ran before deciding to try the DISM... command again and this time I had SUCCESS!!

net stop wuauserv

net stop bits

• Edited by Kathleen at GL 8 hours 36 minutes ago

I've burned a lot of daylight with this problem on different 2012 r2 servers.  I started coming across some other weird stuff in my installs from my ISO so I downloaded another and then got more weird stuff. Long story short, I ordered the media for our volume licensing. I copied the contents of SXS from the media to a temp folder on the server.  I have previously used this command (as administrator):  

Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess 

which worked on the last last server and windows 8 workstations flawlessly. I copied the Windows 8 SXS or used a DVD for the workstations but same command.

I didn't have any of the updates mentioned installed so nothing to uninstall there.

With the new media, I went back to adding Roles on the server and, in fine print at the bottom and in blue, I clicked on the link to specify an alternate source path.   It still failed.

This wouldn't be as frustrating if it didn't take so long to report the failure (or success) but just fuels the fire.

In summary - uninstall the updates mentioned, if they were installed. I did not have them installed.

Either run the command as administrator once the SXS files are copied or with the media in the drive, where D: is where the Sources\SXS folder is:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess

Make sure you have a good copy of ISO or media DVD of the OS you are trying to install .net 3.5 from.

I ran the following 2 commands first as I was going to attempt connection straight to Microsoft Updates but thought I might be inviting more trouble - all our updates come from WSUS.  Can't say that they helped but these were the last 2 commands I ran before deciding to try the DISM... command again and this time I had SUCCESS!!

net stop wuauserv

net stop bits

• Edited by Kathleen at GL Friday, August 07, 2015 10:48 PM