Microsoft KB3004394 was supposed to be a simple update to the Windows Root Certificate Program. All it was supposed to do was change the frequency that Windows looks for root certificate updates from once a week to once a day.
Some of the other errors you might see after installing this update:
- Inability to run or download Windows Updates. Which means the inability to uninstall this update for some.
- Unexpected UAC prompts. All MMC functions now require Administrator action even if logged in as administrator.
- Windows Diagnostic Tool error 8000706f7
- Failure when installing AMD and NVIDIA graphics driver updates.
- Windows Defender error 2147023113
- “Windows not genuine” notifications
- Validation Code: 0x8004FE21
Affected versions of Windows include Windows 7 SP1 and Windows Server 2008 R2 SP1.
To quote Microsoft KB3004394:
Issue for Windows 7 SP1 and Windows Server 2008 R2 SP1
Microsoft pulled the update, but not soon enough. If you have it installed, you may notice that you can’t uninstall it either – because Windows Update is broken.
The official Microsoft supported fix is to download and install MS 3024777. It’s a small patch that will require a reboot. Some users have reported that multiple reboots may be required to clear the “Windows not genuine” errors.
Other unsupported methods for fixing this. Run one of the following commands:
wusa /uninstall /kb:3004394 /quiet /norestart
dism.exe /online /remove-package /packagename:Package_for_KB3004394~31bf3856ad364e35~amd64~~220.127.116.11 /quiet /norestart