Vista compatible free AV's

I assume this may have been covered in other threads, but I would like to ask about free AV's exclusive to Vista compatability. I will be setting up a new computer for my Son who is a complete newbie to computers, and can't afford to buy software for some time after buying this computer. Which are the obviously best free AV's? As for me, I'm using XP and am not familiar with Vista's configuration so I will be learning as I set the computer up for him. Groan.
Thanks for any advice.

 

avira,avg,avast

 

PC Tools Antivirus/ThreatFire,McAfee VirusScan Plus – Special edition from AOL/McAfee Internet Security Suite –
Special edition from AOL

 

I agree with the above suggestion - install the free security suite that comes with your ISP. Nearly all of them offer one (e.g. I have McAfee suite from Comcast) and despite what you read on these forums, the protection they give is good enough for the majority of users, and more importantly, they are designed for new users and not advanced power users, so there's less to tweak and a lower learning curve.

 

Many universities and employers make their enterprise AV's available for home use. Mostly this would include Symantec, McAfee and Trend Micro, but there are others.

 

Free McAfee still on that natwest site-

http://www.natwest.com/microsites/personal/latest_deals/index.asp?referrer=online

I believe Avira still had their 90 day offer-

suite offer-
http://www.avira.com/en/evaluate/vnu.php

personal premium-
http://www1.avira.com/en/evaluate/chip.php

ashampoo antivirus- this should be an avira personal premium OEM, 1 year license (I have heard there were issues with some features in the past) also make sure this is version 1.5 and Vista compatible


http://www2.ashampoo.com/webcache/html/1/trial_step_1_2674_2.htm