Thats not a problem at all. You might wanna use CCleaner to clear out your registry when you uninstall it all and then restart your PC. Then when you install it all and when you want to activate the mod, make sure you run FLMM as Administrator, and when you click activate, leave your PC be, dont do anything. It'll take 5-15 minutes (depending on your PC specs) to activate. That's what I did and it was all good for me. I hope you'll make your FL playable Enjoy!