Windivert Driver Cannot Be Installed You Must Restart Your Computer Link

If a restart doesn't help, remnants of a previous WinDivert installation are likely conflicting with the new one. Windows is detecting the old "signed" driver and refusing to overwrite it until a reboot clears the memory—except the reboot never clears the file.

Steps to clear the driver cache:

  • Delete these .sys files.
  • Also look for WinDivert.dll and WinDivert.inf in the application folder and delete them.
  • Restart your computer (refer to Solution 1 for a "real" restart).
  • Launch the application again; it should regenerate the driver cleanly.

    • Before we fix it, it helps to know what it is. WinDivert is a user-mode packet capture/divert driver. It allows software to intercept, filter, and modify network traffic on your Windows machine. It is a legitimate tool used by many open-source and commercial applications to manage network flows without requiring a complex kernel-mode driver. If a restart doesn't help, remnants of a

    However, because it interacts deeply with the Windows networking stack, Windows protects it aggressively. If a previous installation attempt failed, or if Windows Update installed a generic driver over it, the system puts a "lock" on the driver that requires a reboot to clear.

    The error message is vague, but it generally points to one of three underlying issues. You are seeing this message because the installer attempted to install or update the WinDivert driver, but the operation failed. The "you must restart your computer" suggestion is Windows’ default solution for clearing file locks and pending operations. Delete these

    Here are the specific reasons:

    Since the error suggests a restart, but restarting didn't help, you need to manually force-clean the driver queue. Before we fix it, it helps to know what it is

  • After cleanup, restart your PC once more and attempt installation.

    • While modern versions of WinDivert are signed, sometimes Windows Security gets overly aggressive regarding the installation date or certificate validity.