If you are concerned about spyware and pop up advertisments download Ad-Aware (free) from www.lavasoftusa.com. You have no idea the amount of hidden spyware placed on your computer every day some of the nastier ones are in your registry. Each one of these spyware programs uses up resources on your computer making it slower and slower.... go get Ad-Aware and while you are at it download a free firewall like ZoneAlarm as well. And yes you can use a firewall and still share your media files!