Ewido Security Suite is awsome too. Not sure of the URL, but you can get a 30 day free trial demo.It also helps to use a personal firewall onto your PC to stop adware, but one of the biggest preoblems is that a lot of programs incorporate adware and spyware into thier setup programs, so something like Ewido sorts them out before they end up on your PC.
Guitar player, bassist and vocalist myself! Have an 8-track studio in my home. Just finished recording my own blues CD...guess what I want my free space for ;-)