If you still use XP get Kaspersky Anti-Virus for free. The instructions and T&C's are on the page.
kaspersky internet software @ the GoodGuys (29$) + a free Tech Titan power Bank (value @ 49$ or 29USD on TT website) via redemption. Ends on Sunday. http://www.buykaspersky.com.au/techtitan/
This one is for the kaspersky fans...Seems to Exclude Renewals tho... Bonus Double Deal applies to 1 PC 1 Year and 3 PC 1 Year only.