I can't install net framework 3.5 even when it is online or offline mode. Last time I tried to install with command prompt.

This is the copy of the command prompt:

"

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.

C:\Windows\system32>cd\

C:\>DISM  /Online  /Enable-Feature  /FeatureName:NetFx3  /All  /LimitAccess  /So
urce:e:\sources\sxs

Deployment Image Servicing and Management tool
Version: 6.3.9600.17031

Image Version: 6.3.9600.17031

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

Error: 6800

The function attempted to use a name that is reserved for use by another transac
tion.

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

"

Sorry I can't upload the screenshot from command prompt. Please help me. Thanks.

Kindly go through the following article:

Update for the .NET Framework 3.5 on Windows 8, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2

If the above doesn't help then try:

  Microsoft .NET Framework Repair Tool

Thank you. But I can't download Microsoft .NET Framework Repair Tool from the Official Site. Please give me the mirror.

What problem are you facing to download from the official site?

The following links are working fine:

http://www.microsoft.com/en-us/download/details.aspx?id=30135

http://www.downloadcrew.com/article/27704-microsoft_net_framework_repair_tool

C:\>DISM  /Online  /Enable-Feature  /FeatureName:NetFx3  /All  /LimitAccess  /Source:e:\sources\sxs

I think the "/LimitAccess" parameter must be last ?

https://support.microsoft.com/en-us/kb/2785188

https://msdn.microsoft.com/en-us/library/windows/desktop/hh848079(v=vs.85).aspx

e.g.:
Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:e:\sources\sxs /LimitAccess