What anti-spyware programs are you using? I might be able to recommend some that you're not running... and if you can find the file that hosts the virus, the way to get rid of it is to boot in safe mode, delete the file, and then delete it from the Trash. Often you can't delete a virus in normal running mode.
I run Adware and Spybot pretty regularly. And I've got McAfee Anti-Virus - although that's been since I've had problems. It tells me there are no infected files, but it does give a list of potential problems that I'm unable to delete.