📎 AI Summary:
The WindowsForum thread discusses issues with installing .NET Framework 3.5 required for the W7F Diagnostic Tool, specifically encountering an error during download. Multiple solutions are suggested: changing Windows Update settings via Registry edits, mounting a Windows ISO to use the DISM command to enable the feature, or removing and reinstalling .NET Framework through Control Panel. The overall sentiment is helpful, with users sharing different troubleshooting methods to resolve the installation problem.
P

pers0n

New Member
Joined
Mar 2, 2020
Messages
4
Thread Author #1
Was trying to install W7F Diagnostic Tool and I have to have .net framework 3.5 but get this error.

It will download, but once the install begins this error comes up.
An image from 'Net Framework 3.5 won't install - error 0x080240438'. Windows error message: .NET Framework 3.5 installation failed with error 0x80240438.
 

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Solution
Neemobeer
This usually happens when the feature binary is missing (common in business). Download a Windows 10 ISO and right click iso and select mount.
Assuming it mounts to the D drive open an elevated command prompt and run

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs If it mounts to a different letter change the /Source:D to the appropriate drive letter.
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A

AdrianG001

Senior Member
Joined
Feb 19, 2018
Messages
108
#2
I had this problem as well on my machine at work.
Try doing the following it worked and allowed me to download
the .Net Framework 3.5 on my Windows 10 azure virtual desktop PC : Go into RegEdit and
set the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU folder.
DoubleClick on UseWUServer(UseWindowsUpdateServer) and change the value to 0.
If the value is already 0 this fix may not work for you. RESTART afterwards.
 

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Neemobeer

Neemobeer

Windows Forum Team
Staff member
Joined
Jul 4, 2015
Messages
8,995
#3
This usually happens when the feature binary is missing (common in business). Download a Windows 10 ISO and right click iso and select mount.
Assuming it mounts to the D drive open an elevated command prompt and run

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs If it mounts to a different letter change the /Source:D to the appropriate drive letter.
 

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Solution
R

raavan

Active Member
Joined
Mar 27, 2020
Messages
5
#4
Go to control panel and First remove all .net framework

Sent from my Mi A1 using Tapatalk
 

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S

samK

Member
Joined
Apr 18, 2020
Messages
84
#5
Go into RegEdit and
set the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU folder.
DoubleClick on UseWUServer(UseWindowsUpdateServer) and change the value to 0.
 

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