1. Re-Register Windows Update DLL Files
- Open Command Prompt as Administrator and run these commands:
regsvr32 Qmgr.dll /s
regsvr32 Qmgrprxy.dll /s
regsvr32 Wuaueng.dll /s
regsvr32 Wuapi.dll /s
regsvr32 Wucltui.dll /s
regsvr32 Wups.dll /s
regsvr32 Wups2.dll /s
- After completing this, restart your system and try updating again.
2. Restore Missing Windows Update Services Using PowerShell
- Open PowerShell as Administrator and run:
Get-Service -Name wuauserv
- If it shows cannot find service, restore it with:
sc.exe create wuauserv binpath= "C:\Windows\system32\svchost.exe -k netsvcs" start= auto
- Then restart your PC.
3. Use Windows Update Troubleshooter
- Go to Settings → Update & Security → Troubleshoot
- Click Additional troubleshooters
- Select Windows Update, run the tool, and apply the recommended fixes.
4. Restart Windows Firewall and Base Services
- Press Win + R, type services.msc, press Enter
- Locate and restart:
- Windows Defender Firewall
- Windows Update
- Background Intelligent Transfer Service (BITS)
- Windows Installer
Ensure they are set to Automatic.
5. Repair Windows Using DISM and SFC
- Open Command Prompt (Admin) and execute:
sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth
- These commands fix missing or corrupted system files that cause service registration failures.
6. Reset Windows Update Components
- Open Command Prompt as Administrator, then enter:
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
- Try running Windows Update or Office 365 update again.
7. Run the Office 365 Support and Recovery Assistant (SaRA)
- Download the Microsoft SaRA Tool from the official Microsoft website
- Run it and select Office 365 → I have problems installing Office
- Follow the instructions to automatically diagnose and fix Office-related issues
8. Perform a Clean Boot and Retry Updates
- Press Win + R, type msconfig, press Enter
- Go to Services tab → Check Hide all Microsoft services → Click Disable all
- Go to Startup tab → Open Task Manager → Disable all startup items
- Restart your system and try to update again