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While fcremove.exe is a vital tool for system administrators, its use carries significant risks, primarily due to its aggressive nature. The "exclusive" power of the tool means it bypasses the safety checks inherent in the standard uninstaller.
Open msconfig again and uncheck to return to normal operation. Reboot again.
The true power—and the reason for its "exclusive" nature—lies in its comprehensive and aggressive cleanup process. A standard uninstall, even when run by an administrator, typically does not remove all user data and application settings from the system. These leftover files and registry entries can cause conflicts, prevent a successful reinstallation, or cause upgrade attempts to fail.
Always attempt uninstallation via FortiClient EMS or the Windows Apps menu first. Reserve FCRemove.exe for broken, unresponsive, or orphaned installations.