If your PC is stuck at the Windows logo, spinning in a recovery loop, or showing a black screen after the March 2026 update, you're not alone. KB5079473 and KB5085516 are causing boot failures on a wide range of machines. The good news: you don't need to reinstall Windows.

Here's how to get back in.

Get Into Windows Recovery Environment

You can't fix this from inside Windows because Windows won't start. You need WinRE, which runs before the OS loads.

If Windows fails to boot twice in a row, it should drop you into recovery automatically. If it doesn't, force it: hold the power button to hard-shutdown the PC three times during the boot animation. On the third attempt, Windows should detect the repeated failures and open the recovery screen.

From there: Troubleshoot then Advanced options then Command Prompt.

If you get a blue "Choose an option" screen instead, you're already there. Go to Troubleshoot.

Option 1: Uninstall the Update from Command Prompt

This is the most reliable fix. In the WinRE command prompt:

wusa /uninstall /kb:5085516 /quiet /norestart

If that KB isn't present, try:

wusa /uninstall /kb:5079473 /quiet /norestart

You won't see much feedback. Wait 30-60 seconds, then close the prompt and choose Continue to restart. If Windows boots, you're done.

Option 2: Roll Back via DISM

If wusa doesn't work, DISM can remove the update from the offline Windows image. Still in the WinRE command prompt, first figure out which drive letter Windows is on:

dir C:\Windows
dir D:\Windows

Use whichever one has your Windows folder. Then run:

dism /image:C:\ /get-packages

Look for the KB5085516 or KB5079473 package in the list. It'll have a long name like Package_for_RollupFix~.... Copy the full package name, then:

dism /image:C:\ /remove-package /packagename:PASTE_FULL_NAME_HERE

Close the prompt and restart.

Option 3: Safe Mode

Sometimes the machine will boot into Safe Mode even when normal boot fails. From WinRE: Troubleshoot then Advanced options then Startup Settings then Restart. Press 4 or F4 when the options appear.

Safe Mode loads a minimal set of drivers. If you get in, open Settings, go to Windows Update, view update history, and uninstall the March 2026 updates from there.

Option 4: Startup Repair

If you're getting the black screen and can't even get a command prompt going, let Windows try to fix itself first. From WinRE: Troubleshoot then Advanced options then Startup Repair.

This doesn't always work for update-related failures, but it's worth a shot before going deeper. If it fails, come back to Option 1 or 2.

After You're Back In

Once Windows boots normally, do a few things before the next update installs automatically:

Open Windows Update settings and pause updates for a few weeks. Microsoft usually pushes a fix within days of a widespread boot failure, but you want to wait for that patch to land and get confirmed before letting anything else install.

Check Device Manager for any yellow warning icons. Sometimes the failed update leaves drivers in a broken state even after the rollback.

If the same machine is in a domain or managed by Intune, check with your IT team before re-enabling updates. They may need to approve the patched version first.

Why This Happened

The March 2026 cumulative updates included driver compatibility changes that conflict with certain storage controller configurations, particularly on systems using older Intel RST drivers or NVMe controllers with specific firmware versions. It's a driver stack issue, not a hardware failure. Your data is fine.

Microsoft has acknowledged the issue. A revised update is expected in the April cycle.

Need help getting a machine back online? Contact Rain City Techworks.