FREE antivirus tools can provide ADEQUATE protection.



Here is a more recent Vista specific review for the more discerning of us:

http://www.pcworld.com/article/id,129883/article.html
Consider the testing process that was used:

each app had to try to detect current threats using one- and two-month-old signature files to simulate how well it could block unknown malware.

http://www.pcworld.com/article/id,130869/article.html
In conclusion, there is not much real substantive difference in their top four candidates. My personal preference significantly favors NOD32 (#4) because it 'has the best proactive protection by far' and accordingly is much less reliant on up-to-date signature files. See also:

http://www.eset.com/products/compare...ompetition.php

You can try NOD32 (30 days) if you really want to go the trial route and very importantly, it will COMPLETELY uninstall all traces of itself unlike some other candidates.