Ahhh !! I assume now your referring to Fps Creator Classic in which case that installs in its own directory in the "C/Program files/The game Creators /Fps Creator/
so "No" you do not need to uninstall that...
Reloaded will make a separate Directory...
C/Program files/The Game Creators/ FPS Creator Reloaded.
I think Wolf Understood what you were on about and was correct..
Looking at the post heading "Must I uninstall FPSC, before installing Reloaded?" I can see what the confusion was