You don't need to use Launchpad - I ignore it completely as well as Mission Control. Just don't use either; if either is in your dock, remove it. Check System Preferences > Mission Control to make sure nothing is enabled.
Well, that's strange because Mission control is F9; but, since there is no more Spaces/Expose, it may just have taken over. Can you disable your F3 shortcut to test if it'll work (or, rather, not work).