You have to edit your registry to remove it completely. That is, if you don't have a good program that will do it for. IME, spybot search and destroy works very well, as does AVG Free. If you want to edit your own registry (do so at your own risk!),
click here for a how-to guide. I know this is marked as being for AV2008, but it should be the same procedure for AV2009. Best of luck to you.