AVG Anti virus - Free Anti virus http://free.grisoft.com
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Zone Alarm - Free Firewall
Free firewall with an easy to configure interface http://www.zonelabs.com
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Utility Software
Free CD / DVD Burning Software http://www.cdburner.se
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Burning Blue Ray DVD's and Dual Layer disks
ImgBurn is a lightweight CD / DVD / HD DVD / Blu-ray burning application that everyone should have in their toolkit!
http://www.imgburn.com/
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Watching DVD Movies on your PC
Simply the best free DVD Player on the market, no need for expensive players such as Power DVD, this works with Vista Business as well as XP
http://www.avsmedia.com/DVDPlayer/index.aspx