You might try restarting your computer into Safe Mode and then try to remove it.
Reboot your computer, and start hitting the F8 key, you will see multiple options, and just go to the top of the list and select "start in safe mode with networking". That might do it.
If that doesn't work, try going to
http://housecall.trendmicro.com and use their free virus/malware scanner. It is mainly for antivirus, but it does pick up a lot of malware/spyware too.