Help! All mousebuttons activate expose (cant click)

Ok so I got a MBP and have been setting it up. I plugged in my Razer Deathadder mouse (havent installed drivers yet) and went to go set up expose for the buttons. Well, I set expose to work for mousebutton 3, but somehow my computer bugged and now whenever i click any button (whether it be 1, 2, 3,4, or 5) it activates expose! so now i cant even click to tell expose not to use any mousebutton. All I can do is activate expose. I am currently using my old iMac to write this up, but does anyone know a way to activate expose (or terminate it) using only the keyboard so i can get my mouse to work again? Please help me asap. Thanks.