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How to Fix Windows Update Stuck at 0%, 20%, or 100%

✅ Quick Answer

If your Windows Update is stuck at 0%, 20%, or 100%, the issue is usually caused by corrupted update files, background services not running, insufficient disk space, or temporary internet interruptions. In most cases, restarting Windows Update services, clearing the SoftwareDistribution folder, and running the Windows Update Troubleshooter fixes the problem without data loss.

❓ Why Does Windows Update Get Stuck?

Windows Updates are essential for system security and performance, but they don’t always work smoothly. Many users report Windows Update freezing at certain percentages such as 0%, 20%, 45%, or even 100%. When this happens, Windows may appear unresponsive for hours, causing frustration and concern.

The most common reasons behind a stuck Windows Update include incomplete update downloads, corrupted system files, outdated drivers, antivirus conflicts, or interrupted internet connections. Sometimes, Windows Update services fail silently in the background, making it seem like nothing is happening.

The good news is that most Windows Update issues are software-related and can be fixed safely without reinstalling Windows or losing personal files.

🔧 Fix 1: Restart Windows Update Services

Restarting Windows Update services refreshes the update process and clears temporary glitches that cause updates to freeze.

  1. Press Windows + R, type services.msc, and press Enter.
  2. Find Windows Update in the list.
  3. Right-click it and choose Restart.
  4. Do the same for Background Intelligent Transfer Service (BITS).
  5. Close the window and try updating again.

Screenshot: Windows Services panel showing Windows Update service.

🔧 Fix 2: Run Windows Update Troubleshooter

Microsoft includes a built-in troubleshooter designed specifically to detect and fix Windows Update problems automatically.

  1. Open Settings → System → Troubleshoot.
  2. Click Other troubleshooters.
  3. Find Windows Update and click Run.
  4. Follow the on-screen instructions.

This tool checks for common issues such as missing services, corrupted files, and incorrect permissions.

🔧 Fix 3: Clear SoftwareDistribution Folder

The SoftwareDistribution folder stores temporary update files. If these files become corrupted, updates may get stuck.

  1. Open Command Prompt as Administrator.
  2. Type the following commands one by one:
```

net stop wuauserv
net stop bits
```
  1. Go to C:\Windows\SoftwareDistribution.
  2. Delete all files inside the folder.
  3. Restart services using:
```

net start wuauserv
net start bits
```

Restart your PC and check for updates again.

🔧 Fix 4: Check Disk Space and Internet

Windows Updates require sufficient free disk space and a stable internet connection.

A weak or unstable internet connection can make Windows appear stuck even when it is still downloading updates in the background.

🔧 Fix 5: Perform a Clean Restart

Third-party antivirus or startup programs sometimes interfere with Windows Update.

  1. Press Windows + R and type msconfig.
  2. Go to the Services tab.
  3. Check Hide all Microsoft services.
  4. Click Disable all and restart your PC.

After updating successfully, you can enable services again.

❓ Frequently Asked Questions

Is it safe to turn off my PC if Windows Update is stuck?

If the update has been stuck for several hours with no disk activity, it is usually safe to restart your PC. However, avoid force shutdown during active installation.

How long should Windows Update take?

Most updates finish within 30–90 minutes. Feature updates may take longer depending on system speed.

Will I lose my data while fixing Windows Update?

No. The fixes mentioned in this guide do not delete personal files.

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Last updated: January 2026 • Techfix&Guides