Best Antivirus Engine

[romeo]

avira premium ...... Please dont mention as g0d. It fails too hard!!

Umm KIS 2011 is lovely! But not so good for windows7 64bit (x64) , beacuse of kpp - and kernel mods. Well we all know kasperky do much in kernel. Anyways apart from that, safe run- (i.e kasperksys own sandbox) is no option for 64bits, and some aspects of engine failing in some bits. Unlike 32bits (refering to xp 32) , kis works best here with everything its built for 100percent working (well ofcourse.. Xp it was developed for..)
Has anyone used/tried panda?