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.

Is It Actually Stuck, or Just Slow?

Before doing anything, check if it's actually working:

Open Task Manager → Performance → Network — if network activity is present, it's downloading
Check disk activity — if the drive light is blinking, it's installing
0% for under 30 minutes, or a fixed percentage for under 2 hours — wait, some updates genuinely take this long
Stuck for over 2-3 hours with zero network and disk activity — it's actually stuck, proceed with fixes below

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.

Step 1: Run Windows Update Troubleshooter

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

Or via PowerShell:

msdt.exe /id WindowsUpdateDiagnostic

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."

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

Step 4: Repair System Files

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

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

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

If It's Downloading, Just Slowly

# BITS transfer queue — shows active update downloads and progress
Get-BitsTransfer | Select-Object DisplayName, BytesTransferred, BytesTotal,
  @{n='% Done';e={[math]::Round($_.BytesTransferred/$_.BytesTotal*100,1)}}

If BITS shows transfers with growing progress — it's downloading, just slowly. Two common causes:

Peer-to-peer delivery is slow — Windows may be pulling from other PCs on your network/internet instead of Microsoft servers:

# Force downloads from Microsoft only (no peer sharing)
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\DeliveryOptimization" `
  -Name "DODownloadMode" -Value 0 -Type DWord

Or: Win + I → Windows Update → Advanced options → Delivery Optimization → turn off Allow downloads from other PCs.

Slow DNS resolution delays update metadata lookups:

Test-NetConnection -ComputerName windowsupdate.microsoft.com -Port 443
Set-DnsClientServerAddress -InterfaceAlias "Wi-Fi" -ServerAddresses ("1.1.1.1", "8.8.8.8")
Clear-DnsClientCache

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

Step 7: Download Update Manually

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

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

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

Stuck at "Getting Windows Ready" Screen

This appears after updates install. If stuck for over an hour:

Don't force restart if the drive light is active — it may still be writing
After 2+ hours with no disk activity — force restart (hold the power button)
Windows usually recovers and either continues or rolls back

If it boot-loops after a forced restart: boot from USB → Repair your computer → Startup Repair.

Nothing Worked — Use Media Creation Tool

If you're stuck on an old version and nothing above fixes it, an in-place upgrade replaces Windows Update entirely while keeping your files:

Download Windows 11 Installation Assistant from microsoft.com/software-download/windows11 → run it → choose Update now.

Prevent Future Stuck Updates

# Windows Update service should be Automatic
Get-Service wuauserv | Select-Object Name, StartType, Status

# BITS should be running (downloads updates in the background)
Get-Service bits | Select-Object Name, StartType, Status

Keep at least 10-15 GB free on drive C — updates need space to download and extract.

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.

Getting a specific error code instead of just hanging? See How to Fix Windows Update Errors: The Complete Guide.