For the past few months I’ve been running the latest Insider preview releases of Windows 11 on my main PC. Because we’re in the home stretch of the next feature update (version 22H2, coming in October), that’s a fairly low-risk strategy. But it’s not without occasional hiccups.
This week I ran into one of those annoying low-grade bugs that are inevitable when you live on the leading edge. Windows Update told me a cumulative update was available for my PC. But every time I tried to install it, the update failed with a cryptic error code: 0x800f0990.
I tried every troubleshooting trick I know and couldn’t get that update to install.
Did I care? Not really. Because I knew I could fall back on the ultimate Windows troubleshooting trick, a time-tested technique that swats away those pesky error codes like a big ol’ digital flyswatter.
If you find yourself in a similar situation, feel free to break out the same big gun I did: The Windows repair installation, effectively an in-place upgrade using the same version that’s already installed.
This solution is considerably less drastic than a Windows reset, which wipes out your current installation and forces you to reinstall apps and restore settings. A repair installation “upgrades” your Windows PC using the same major version that’s already installed. In the process, it restores settings to their normal state, undoing whatever tiny change is causing your current issue.
How to do an in-place repair install
Step 1: Download the installer files as an ISO
An ISO file is a single compressed file that contains the digital equivalent of a Windows installation DVD. You’ll find downloadable ISO files that correspond to the Windows version you’re currently running in these locations:
Step 2: Mount the ISO as a virtual DVD drive
Double-click the ISO file to mount it in Windows as a virtual drive. In File Explorer, it’s indistinguishable from a DVD drive, with its own drive letter.
Step 3: Run Setup from the virtual DVD drive
Double-click Setup and wait while the Windows installer goes out and gets the latest updates. Well, not exactly the latest. As part of the fail-safe protocol, the installer downloads the next-to-last cumulative update. That precaution keeps you from getting tripped up if the most recent cumulative update is the cause of your current crashes.
Choose the option to keep all your personal files, apps, and settings, and then click Next.
Step 4: Return to normal
After installation is complete, restart and then check Windows Update to get the most recent cumulative update.
After I finished these steps (it took roughly 20 minutes), the update that had been giving me fits installed without any issues. As a bonus, another problem that had been annoying me for a few weeks was also solved. Previously, each time I restarted my PC the infrared camera that handled Windows Hello face recognition had been unavailable, which meant I had to key in my PIN to sign in for the first time. After completing the in-place reinstall, that face recognition worked again.
Although it seems like a drastic step, doing an in-place repair install is a surprisingly low-key solution that has a way of solving even particularly annoying problems. If you’re stumped, give it a try.
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