What is the best...?

What is the best Antivirus software to download for your computer.

What is the best...?security

BitDefender...

And free... :)

What is the best...?trojan

I used McAfee, on one of my laptops Symantec Antivirus, but on most of my Windows systems: http://www.avast.com/

Basically because it is free and regularly gives me warnings about dangerous stuff so i know it works.

The McAfee SiteAdvisor is handy to check whether sites contain bad content or not (also free, a firefox extension).
No exist, all can fail, depends of your system, but you can use AVG its freeware, also use kaspersky, panda, mcafee, and norton, you can try to use a firewall for more protection (i recommend ZonaAlarm),
The best for me is avast. Visit http://www.avast.com for more details.
ANTIVIR! It's a quality made in Germany.

Please check my answer history regarding this.

For your info, I didn't get any virus for about 6 years now.
avast 4 home edition 4.7

real time protection, and absolutely free!
http://www.symantecstore.com/v2.0-img/op...

Norton Antivirus