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If KB5055523 is stuck at "Pending Restart" and won't finish installing, it usually means something interrupted the update process, or Windows can't complete the final steps of installation. Below are the most common causes:

🔄 1. Windows Didn’t Apply the Update Properly Before Reboot
The update might have downloaded and staged, but Windows failed to apply or schedule it correctly before the restart.

This can happen due to disk write delays, background process interference, or power loss.

Fix: Try restarting your PC manually a couple of times. If the pending state persists, proceed with the solutions below.

2. Corrupted Update Cache or Temporary Files
The SoftwareDistribution or Catroot2 folders contain update data. If these are corrupted, Windows may fail to finalize the installation even after rebooting.

Fix: Reset Windows Update components:

cmd
Copy
net stop wuauserv
net stop bits
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start bits
Then, check for updates again and restart.

3. Pending Update Registry Key Conflict
Sometimes, the registry still holds a "Reboot Required" flag even after you've restarted the system.

Fix:
Open Command Prompt as Administrator and run:

reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired" /f
Then restart your PC and try installing the update again.

4. System Files Are Damaged
If key system files are missing or damaged, Windows can’t apply the update fully, leaving it stuck in a loop.

Fix: Run these system repair tools:

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

CHAPTERS
00:00 Intro
00:17 Solution 1
04:05 Solution 2
05:11 Solution 3
06:37 Solution 4
08:01 Outro