Symptoms
- Update percentage doesn't move for over an hour
- 'Working on updates' screen stuck on restart
- Update fails and rolls back repeatedly
- Error code shown after a failed update attempt
Likely causes
- CommonUpdate genuinely still processingLarge updates can take a long time, especially on slower hard drives.
- CommonCorrupted update cache filesPartially downloaded or damaged update files can stall the process.
- CommonInsufficient disk space for the updateUpdates need free space to download and install temporary files.
- PossibleA specific driver or third-party software conflicting with the updateIncompatible software can block an update from completing.
- Less commonCorrupted system filesDeeper system file damage can repeatedly block updates from installing.
What to do
- Let it sit for at least an hour or two before assuming it's stuck, especially on a laptop, since large updates take time.
- Do not turn off the computer during an update unless it's clearly frozen for many hours with no disk activity light.
- If truly stuck, force a restart by holding the power button, then let it attempt to boot normally.
- Check available disk space and free up room if it's low.
- Run the built-in Windows Update Troubleshooter from Settings.
- Clear the Windows Update cache by stopping the update service and deleting temporary update files (a guided process in Windows support docs).
- Run System File Checker (sfc /scannow) to repair any corrupted system files.
When to call a pro
If updates repeatedly fail after troubleshooting, a professional can perform an in-place repair install without losing your files.
Safety
Use caution
Avoid forcing a shutdown during an update unless there's been no progress or disk activity for several hours, since interrupting some updates can cause further problems.