Have you made a restart between the uninstall and reinstall process? Sometimes this helps a lot. Other than that. the FL key is located in HKLM - Software - Microsoft - Microsoft GamesIts also located there even you did install it anywhere else on your HDD's. I did not find a seperate key for the Crossfire ModThe uninstall key for FL is located HKLM - Software - Windows - Current Version - Uninstall I hope it helps you