Actually you can just install & use the trial period up and then uninstall that one and do a trial of another one.
I went for a year testing the top internet suite programs - just to find the one I liked the best.

the internet suites cover much more than the basic anti virus programs.

here's a couple of reviews/ratings and info on the top ones-
http://internet-security-suite-revie...enreviews.com/
http://www.pcmag.com/article2/0,2817,2358764,00.asp
http://reviews.cnet.com/antivirus-se...ftware/?tag=bc



Zone Alarm is having a sale -
http://www.zonealarm.com/security/en...ity%20programs

I used to use some free stuff but got tired of the problems , i like to download stuff and "test" things, had too many total crashes, so decided to spend a little $$ for piece of mind.
39.00 for a yr & 3 pc - got a free upgrade to extreme last year but this year it was 49.00 for 3 pc - still worth it to me.
once you are a regular customer they send email notice of sales and give discounts - I suppose they all do that though.
to keep their customers.