
Have you tried system restore if your using Windoze XP ? Restoring your system should get rid of it.
There's manual un-install instructions on this web site if that doesn't work
http://www.sawtoothdistortion.com/Articles/Uninstall180Search.html
You could also install Spyware Blaster which stops that kind of nasty getting on your system
http://www.javacoolsoftware.com/sbupdate.html
Also install Microsofts own spyware program, it used to be called Giant and cost money to buy, but Microsoft bought it and its free at the moment and its very good too
http://fileforum.betanews.com/detail/Microsoft_Windows_AntiSpyware/1105022593/1