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

Windows Updates are supposed to keep your system secure, stable, and up to date. But sometimes, the update process itself becomes the problem—stuck at 0%, refusing to start, or frozen at 100%, never finishing. If you’ve stared at the update screen for hours wondering if it’s broken or just slow, you’re not alone.

Why Does Windows Update Get Stuck?

When an update hangs at 0% or 100%, it usually means something is interfering with the process. Common causes include:

  1. Corrupted update files – Temporary update cache files can break the process.

    • Network issues – A weak or unstable internet connection can prevent download or installation.

  3. Insufficient disk space – Windows updates need extra room to unpack and install.

  4. Antivirus/firewall interference – Security software can block update components.

  5. Background processes – Third-party apps or even other Windows services may conflict.

  6. System file corruption – Broken system files may stop updates from applying.

Step-by-Step Troubleshooting

Step 1: Wait It Out (But Not Too Long)

Sometimes updates appear stuck but are actually working in the background. If the progress bar hasn’t moved after 30–60 minutes, it’s likely frozen and needs troubleshooting.

Step 2: Check Your Internet Connection

  • Run a speed test at Speedtest.net.

  • Switch to a wired Ethernet connection if possible.

  • Restart your router.

If the connection is unstable, Windows Update may freeze at 0%.

Step 3: Restart Windows Update Service

  1. Press Windows + R, type services.msc, and press Enter.

  2. Find Windows Update in the list.

  3. Right-click > Stop, then right-click again > Start.

  4. Retry the update.

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