Windows won’t start

Windows won't boot after a recent update

The PC worked fine before, but after installing a Windows update it now fails to start, showing a black screen, error, or boot loop. This points directly to the update as the trigger.

Difficulty
Intermediate
Time
30–90 minutes
DIY cost
$0
Pro cost
$80–$180

Symptoms

  • Problem started immediately after an update installed and restarted
  • PC worked normally the day/session before
  • May show a specific error, black screen, or repair loop
  • Sometimes affects only certain drivers or features

Likely causes

  • CommonUpdate conflicting with a specific driverGraphics, storage, and network drivers are the most frequent culprits after updates.
  • CommonUpdate itself has a known bugMicrosoft occasionally releases updates that break startup for certain hardware.
  • PossibleInterrupted update installation (power loss, forced shutdown)An update stopped partway through can leave the system in a broken in-between state.
  • PossibleIncompatible third-party software or antivirusSome software doesn't handle Windows updates gracefully.
  • PossibleInsufficient disk space during the updateUpdates can partially apply and then fail if space runs out mid-process.

What to do

  1. Interrupt startup 2–3 times to force Windows into the Recovery Environment.
  2. Go to Troubleshoot > Advanced options > Uninstall Updates, and remove the most recent quality or feature update.
  3. Restart and check if the PC boots normally again; if so, delay that update from reinstalling immediately via Settings > Windows Update > Pause updates.
  4. If Uninstall Updates isn't available or doesn't help, try System Restore to a point before the update, if one exists.
  5. If neither works, boot into Safe Mode and check Device Manager for any drivers marked with a warning icon, updating or rolling them back as needed.
  6. Once stable, before allowing the update to reinstall, free up disk space and temporarily disable third-party antivirus during the next update attempt.
  7. Report the issue via Feedback Hub if it's a known widespread issue, and check Microsoft's release health page for a fix or workaround.

Tools and parts

  • Bootable Windows recovery USB drive

When to call a pro

If uninstalling the update and System Restore both fail to restore a working boot, a professional can perform a repair install that preserves files while resetting system components.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.