@ bigspanner
yes, My mistake, SAS is superantispyware, your link is correct.
Spyware Blaster is a good immunization tool. Im not to sure if Spybot search and destroy is any good, as I dont use it, and havnt really seen it recommended here.
Usually you can upgrade to 5 on top of 4.8, I did, and didnt have any problems. if you have problems you'll need to do a complete unistall via the control panel. Which is usually enough, if not the removal tool will need to be used. There's been different steps in doing this exactly so if you have problems, just ask and someone will help you.
Sat