The message "WinDivert driver cannot be installed — you must restart your computer" appears when software that uses the WinDivert packet-capture driver (commonly VPNs, network filtering tools, or traffic-modifying utilities) fails to load or update the kernel driver and the installer requests a reboot to complete driver installation or replacement.
To verify that system files are not corrupted, perform the following: The message "WinDivert driver cannot be installed —
Most often, this error occurs because a previous session of a program using WinDivert (like a VPN, specialized firewall, or game lag-reduction tool) crashed without properly removing the driver service. Ensure that your Windows system and drivers are
Search for and delete WinDivert32.sys and WinDivert64.sys from your system folders or the application directory. network filtering tools
Ensure that your Windows system and drivers are up-to-date, as outdated versions can cause compatibility issues.