AVG is a full featured anti-virus software package available from Grisoft. A free version is available for home use, and it includes free updates.

Firefox is an award winning open source web browser. Features include built in pop up blocking, tabbed browsing, and default settings that will keep you safe from spyware.

Thunderbird is the perfect complement to firefox. This open source email client includes features such as built in spam filtering (which you train to suit your specific needs) and a built in RSS feed parser.