spybot search and destroy, adaware are the most well known ones also microsofts antispyware program seems pretty good as for antivirus programs i like mcafee its never let me down but people will argue that it uses a lot of resources
does anyone think the MS one will be anygood? I have lavasoft but when i boot up it results in a bluescreen!!!! so at the mo i am just using Spybotand Avast!