Both the one in your user folder and the one in the. Root. Of the hard drive.
Also check with the software developer for an un-installer.
Check also the app data folder in both the libraries
I have a Mac mini Intel running Snow Leopard. I had purchase a virus software that I let expire, and now I get a constant pop-up reminder to renew. I deleted the software folder, but where is that reminder located so I can delete it?