Windows 11 crashing, freezing, or locking up after installing the March 2026 update? KB5079473 is causing system instability for a subset of users. File Explorer hangs, the Start menu stops responding, apps freeze mid-use, and some machines hit full blue screens.

This is separate from the sign-in bug and install failures we covered earlier. These crashes are tied to driver conflicts and hypervisor issues introduced by the update.

Quick Fix: Uninstall KB5079473

If your system is unstable, remove the update first and stabilize:

  1. Open Settings > Windows Update > Update history
  2. Scroll down and click Uninstall updates
  3. Find KB5079473 and click Uninstall
  4. Restart your PC

If Windows is too unstable to reach Settings:

:: Boot into Safe Mode first. Hold Shift while clicking Restart to get there
:: Then open Command Prompt as Administrator
wusa /uninstall /kb:5079473 /quiet /norestart
shutdown /r /t 0

Stop the Update From Reinstalling

Windows will try to push KB5079473 again. Pause updates while you sort out the root cause:

# Pause updates for 35 days
Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\WindowsUpdate\UX\Settings" -Name "PauseUpdatesExpiresTime" -Value (Get-Date).AddDays(35).ToString"yyyy-MM-ddTHH:mm:ssZ"

Or go to Settings > Windows Update > Pause updates and select the maximum duration.

Fix Hypervisor Crashes

Some users are getting HYPERVISOR_ERROR blue screens after this update. This affects systems running Hyper-V, WSL2, Windows Sandbox, or Docker Desktop.

:: Disable the hypervisor temporarily
bcdedit /set hypervisorlaunchtype off
shutdown /r /t 0

To re-enable later. Re-enable it after Microsoft patches the conflict:

bcdedit /set hypervisorlaunchtype auto
shutdown /r /t 0

Fix File Explorer and Start Menu Freezes

If Explorer keeps hanging or the taskbar disappears:

Restart Explorer without rebooting:

Stop-Process -Name explorer -Force
Start-Process explorer

Clear the Explorer cache:

# Close Explorer first
Stop-Process -Name explorer -Force

# Clear icon and thumbnail cache
Remove-Item "$env:LOCALAPPDATA\Microsoft\Windows\Explorer\iconcache*" -Force -ErrorAction SilentlyContinue
Remove-Item "$env:LOCALAPPDATA\Microsoft\Windows\Explorer\thumbcache*" -Force -ErrorAction SilentlyContinue

# Restart
Start-Process explorer

If Start menu is completely broken:

# Re-register Start menu components
Get-AppXPackage -AllUsers | Where-Object {$_.InstallLocation -like "*StartMenuExperienceHost*"} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Fix Driver Conflicts

The most common crash trigger is a conflict between KB5079473 and older GPU, chipset, or anti-cheat drivers.

Update your GPU driver:

Check Event Viewer for the crashing driver:

# Find recent crash events
Get-WinEvent -LogName System -MaxEvents 50 | Where-Object {$_.LevelDisplayName -eq "Critical" -or $_.LevelDisplayName -eq "Error"} | Format-Table TimeCreated, Id, Message -Wrap

Look for entries mentioning a specific .sys file. That tells you which driver is the problem. Update or roll back that specific driver in Device Manager.

Anti-cheat software conflicts:

Gamers are reporting BSODs in titles using Easy Anti-Cheat and BattlEye. If you are crashing during games:

  • Update the game since anti-cheat updates often ship with game patches
  • Check if the anti-cheat vendor has released a compatibility update
  • As a workaround, avoid launching those games until the conflict is patched

Run System File Checker

If crashes damaged system files:

:: Run as Administrator
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Reboot after both commands complete.

What Causes This

KB5079473 shipped changes to Secure Boot certificate handling, WDAC COM allowlisting, and File Explorer search. The combination of these changes creates conflicts with certain OEM drivers and third-party kernel-level software.

This is not a universal problem. Microsoft disputes the scale of the reports, and the evidence points to specific hardware and software combinations rather than a blanket OS bug. But if you are one of the affected users, the crashes are very real.

Windows updates wreaking havoc on your office PCs? Rain City Techworks manages patches and updates for businesses across the Seattle-Tacoma area so your team stays productive. Get in touch if you need help stabilizing your systems.