system unusable... please help

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http://forums.opensuse.org – i just installed opensuse 11.2 kde4 after using ubuntu 9.10 with gnome for a while. I have to say i like it a lot. Kde is awesome. But at login i went and clicked on where you choose the window manager and out of curiosity clicked on metacity (mistake on my part) and now when i boot up i just get a black screen and mouse. My guess is that if a can logout i can change it back to kde but autologin is enable. PLEASSSSSSEEEEE HEEEELLLLPPPP!!!!! (Distributions)