AV /Malware software

Hello Everyone, i have several AV / Mal-aware software packages running in my machine (probably not a good idea to have them all installed )Outpost security suite.
Malwarebytes ,Spy-bot, lava soft MS security essentials, windows firewall.

And it seems that my CPU is working very hard when i try to open any applications and or web browsers. anywhere from 20 to 40 percent for any given task.

Also my boot up time is very long, probably due to all the AV software installed, i would like to uninstall all of them, to see if my CPU load, and boot time get any better, what would be the best optimum AV / malaware (Free )package to use ?

Thanks in advance,

hello again, so i can remove everything i have and just use Microsoft Security Essentials the free Mal aware bytes. and i should be OK, virus and malware wise ?

thanks in advance

OK thanks for all the Ideas, i will uninstall everything , reboot, then re install
Microsoft Sercuity Essentials.
Built in Windows 7 Firewall
Malwarebytes Anti Malware Free version
FilehippoUp Date Checker.

and hopes that improves my system, if not i know i have to look else where to see whats using up my CPU,

i do go to a torrent site once in a while, but not that often, i know there are viruses on those site, so i am very careful on what i get, and always do a scan before i instal

once again, thanks for all the info.