Microsoft update KB3033929 is causing a reboot loop for numerous Windows 7 users. The patch was issued on Patch Tuesday in March 2015 (the second Tuesday of every month when Microsoft issues most security updates) for Windows 7 and Windows Server 2008 computers. It’s unknown if the reboot loop affects Windows Server 2008 computers which has had the KB3033929 update applied.
The Microsoft advisory states that some users will be unable to install the patch if they have a multiple-boot configuration of Windows and various distributions of Linux, use a non-Windows boot loader (this is common for computers that multi-boot Windows and Linux), and have Windows and Linux installed on separate drives (this is also common for computers that multi-boot Windows and Linux). It’s unclear what effect will occur if only one of the above conditions is present.
It appears that Microsoft doesn’t see the KB3033929 update as a critical one. Thus if you haven’t installed it yet, do not do so until Microsoft reissues the update.
If your computer is stuck in a reboot loop because of this patch, here’s how to uninstall it:
- Start your computer into Safe Mode using this method or this method
- Go to Control Panel and then Programs and Features
- Click View installed updates
- Click Security Update for Microsoft Windows (KB3033929) and then Uninstall
- Restart the computer when prompted