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The full error message typically reads something like:
The simplest and most straightforward solution is to restart your computer. This often resolves issues related to driver installations, as it clears the system's driver cache and allows for a clean installation. This public link is valid for 7 days
Troubleshooting "WinDivert driver cannot be installed. You must restart your computer" Error
Occasionally, Windows incorrectly flags the driver signature. Can’t copy the link right now
If you are using GoodbyeDPI , users have found success by copying WinDivert64.sys directly into the C:\Windows\System32 directory to bypass loading issues, though this should be a last resort. WinDivert not working on Windows 10 20H2 #253 - GitHub
When an application triggers this specific error, it means the software successfully loaded the user-mode library but failed to register or start the kernel driver. The most common reasons for this failure include: This often resolves issues related to driver installations,
A previous instance of the driver is still active.
Open (or your third-party antivirus dashboard).
Hold the while clicking Restart in the Windows Start Menu.