I was playing online and someone had a hack that gave all of my infinite ammo weapons rapid fire. The problem is that now whenever I play I have rapid fire on these weapons and I don't want it. How do I remove it?
It may have somehow saved over to your profile as most mods warn you to back up your save.bin file before using mods and trainers.
Try removing your save file (C: > User > Documents > Capcom > RE5 > profile name), start another game and see if it's still there. If not, then it's your save file. In which case I would d/l a trainer with the rapid fire cheat and deactivate it in-game.