I used Norton antivirus since my university time. It is one of the most powerful antivirus except its extensive use of memory . According to reviews, new Norton Antivirus 2009 & Norton Internet security 2009 are overhauled and reengineered to be lighter and faster. I would like to share some legal way to help you save $19.95 annual subscription fee. Norton Antivirus 2009 free edition can be obtaion via a few link at bottom.
Here is the latest version 2009 of Norton Antivirus available . Just download packs and use them one by them right after previous one expires. In fact 360 days @ 1 year protection for free 
free-norton-antivirus-2009
Download Links are
Norton Antivirus 2009 – 90 Days English
Norton Antivirus 2009 – 90 Days English
Norton Antivirus 2009 – 180 Days German
*German version work fine on any other region/language windows OS.