Spycrusher is part of Smitfraud so the above recommendation wont do much more than mask the problem.
My advice is to register here
http://forum.malwareremoval.com/index.php
Download and extract this
http://downloads.malwareremoval.com/hijackthis _sfx.exe
to My Documents
Open it by clicking on the icon and click on "scan and save a logfile"
It will save a text log in the same folder. Start a thread in the Malware Removal room where a voluntary expert will get you cleaned up.
It might even be me.