Help with Poltergeist

My girlfriend messed around with a ouiji board a little too much and now she's paying for it.  It seems a particular spirit named JAKOB has taken residence in her apartment and is doing all the little poltergeist things (drapes, lights, alarm clock, etc) and even wrote its name on the mirror. 

Anyway, I need some help to get rid of it.  She's too freaked out because she's been there when most of the stuff happened.  Apparently it can even mess with her computer when she's typing so she has stopped using it.

Its not gotten dangerous, merely annoying, but any help or suggestions ASAP would be GREATLY appreciated. 

Thanks in advance.

anusfart