How to Fix Windows Update Stuck at 0%, Downloading or Installing

Windows Update getting stuck is one of the most common Windows issues. Here's a systematic approach that fixes it in most cases.

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Quick Fix First

# Restart Windows Update services
Stop-Service wuauserv, bits, cryptsvc -Force
Start-Service wuauserv, bits, cryptsvc

# Check for updates again
Start-Process "ms-settings:windowsupdate"

If that doesn't work, proceed to the steps below.

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Step 1: Run Windows Update Troubleshooter

Win + I → System → Troubleshoot → Other troubleshooters → Windows Update → Run

Or via PowerShell:

msdt.exe /id WindowsUpdateDiagnostic

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Step 2: Clear the Update Cache

This is the most effective fix for stuck downloads:

# Stop services
Stop-Service wuauserv, bits, cryptsvc -Force

# Delete cached update files
Remove-Item "C:\Windows\SoftwareDistribution\*" -Recurse -Force -EA 0
Remove-Item "C:\Windows\System32\catroot2\*" -Recurse -Force -EA 0

# Restart services
Start-Service wuauserv, bits, cryptsvc

Write-Host "Done. Check Windows Update now."

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Step 3: Reset Windows Update Components

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old

net start wuauserv
net start cryptSvc
net start bits
net start msiserver

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Step 4: Repair System Files

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

Run as Administrator. DISM first, then SFC. Restart after completion.

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Step 5: Check Disk Space

Updates need free space — at least 10-20 GB:

Get-PSDrive C | Select-Object @{n='Free GB';e={[math]::Round($_.Free/1GB,1)}}

If low — run Disk Cleanup:

cleanmgr /sageset:1
cleanmgr /sagerun:1

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Step 6: Fix Stuck Pending Update

If an update is stuck "Pending Install" or "Pending Restart":

# Check pending operations
(New-Object -ComObject Microsoft.Update.SystemInfo).RebootRequired

# Force restart to complete pending updates
Restart-Computer -Force

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Step 7: Download Update Manually

If a specific update keeps failing — download it directly from Microsoft Update Catalog:

1. Go to catalog.update.microsoft.com
2. Search by KB number (e.g., KB5055523)
3. Download and run the .msu file directly

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Step 8: Reset Windows Update via Registry

# Re-register Windows Update DLLs
$dlls = @(
  "atl.dll","urlmon.dll","mshtml.dll","shdocvw.dll",
  "browseui.dll","jscript.dll","vbscript.dll","scrrun.dll",
  "msxml.dll","msxml3.dll","msxml6.dll","actxprxy.dll",
  "wuapi.dll","wuaueng.dll","wucltux.dll","wups.dll",
  "wups2.dll","wusvc.dll","wuwebv.dll"
)
foreach ($dll in $dlls) {
  regsvr32.exe /s $dll
}
netsh winsock reset

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Summary

Try in order: restart WU services → clear SoftwareDistribution folder → run DISM/SFC → check disk space → manual KB download. Clearing C:\Windows\SoftwareDistribution fixes 80% of stuck update issues. Always run as Administrator.