You should go to download.com and search for AVG 8 free.
Then download the software. This software is free and used by millions. You should do this because today no protection is the equivalent to you leaving your door open. There are many threats out there. Phising, viruses, memek spyware, adware, trojans, worms, pharming, packet sniffing and wifi intrusion. But first you should get aqainted with viruses and other malware before diving into phising, pharming and packet sniffing.

Dont worry just go to download.com and download AVG 8 free. Good luck. As soon as its downloaded run a full system scan to make sure you are not infected by know threats.