Windivert Driver Cannot Be Installed You Must Restart Your Computer Top ~upd~ May 2026

This is a very common and frustrating error, typically associated with software that needs to intercept or modify network traffic (such as VPNs, ad blockers like AdGuard, or firewall applications like SimpleWall).

Here is a review of the error message, what it actually means, and how to fix it. This is a very common and frustrating error,

2. Check for "Ghost" Drivers

If you have used a similar program before (e.g., switching from one ad-blocker to another), the old driver might still be "installed" but inactive. Right-click the Start button and select Device Manager

1. Right-click the Start button and select Device Manager.
2. Click View > Show hidden devices.
3. Expand Network adapters.
4. Look for entries related to "WinDivert" or the software you are using (it might be greyed out).
5. Right-click them and select Uninstall device.
6. Restart and try again.

3. Run Installer as Administrator

Ensure you have administrative privileges. reinstall the tool

• Action: Right-click on the Windivert installer and select "Run as administrator."
• Verification: Attempt to install the driver.

5. Check for antivirus interference

Some security software blocks kernel drivers. Temporarily disable your antivirus, reinstall the tool, then re‑enable it.

Prevention: Avoiding the “Must Restart” Loop in the Future

Once you have resolved the issue, follow these best practices to prevent recurrence:

• Always run VPN/network tools as Administrator.
• Before installing new network software, check Windows Update and restart if pending.
• Keep WinDivert updated – check GitHub every few months.
• Whitelist your VPN/proxy folder in antivirus.
• Do not force shutdown during driver installation – use proper restart.

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