First off, no need to use CAPITALS. It's the web equivalent of yelling. Also a little hard to read.
As to the best, there isn't one. There are plenty of user opinions as to what is best, but really what is best on one day might be second or third best on another. Their abilities can differ depending on the malware, when it was release, etc.
What will likely be best for you is a piece of software that is stable, has generally good detection and cleaning ability, that you can easily get to grips with (ie; intuitive interface/good help file/good forum or other support) and that doesn't bog your system down.
I see in your other thread you are using Vista 64bit. That seriously limits what you can put on it. A lot of the popular free AV's and Firewalls don't have a 64bit version (yet.) So you might have to go with something that does. I use a roll-your-own-freeware suite myself.Separate AV, AS, and firewall, plus a couple other bits and pieces. You may not wish to do that, nor have the luxury of being able to.
You've indicated you aren't too computer savvy. In your situation I think a good result might be achieved by a pay-for suite like NIS 2009, by Symantec. Earlier Symantec versions attracted a lot of notoriety for being bloated, and having poor support. A lot of folk won't use them. But I've read quite a number of good user opinions about NIS2009.
Kaspersky does have a good rep, but there are lots of reports of slowdowns. NOD32 also has a good rep. Webroot...once did. AVG once did. They appear to be a bit buggy now.
I SEE A LOT OF CONFLICTING REVIEW I HAVE TRIED KAPASPERSKY AND THE AVG AND BOTH OF THEM COMPLETING SLOWED DOWN MY SYSTEM OR THE SYSTEM WONT START RIGHT OR JUST CUT OFF I TRY TO DO RESEACH BEFORE I BUT BUT IT IS SO MANY CONFLICTING REVIEWS I SEE WEBROOT ONSEVERAL SITES AS NUMBER ONE AND THAN I SEE SHIELD DELUXE AS ONE OF THE NUMBER ONES AND KAPASPWRSKY AS NUMBER WHICH AS I SAID CAUSES MAJOR GLINCHES IN THE SYSTEM AND WEBROOT AS A NUMBER ONE ON ANOTHER SITE I AM RUNNING WINDOWS XP SERVICE PACK 2 OR 3 I BELIEVE ON A GATEWAY MEDIA SYSTEM 819GM CAN SOMEONE HELP ME WITH A LOGICAL CHOICE THANK YOU