HELP! Aero vista beta 2 problems.

i've been working all night to try and get this going, here's my specs first:

ati X850 PE
AMD athlon 64 3400+
2.00 Gig's of ram
50 gigs of free hard disk space (2 other hard-drives totalling in 400 gigs)
windows vista beta 2 5384

Alright i installed the beta last night, activated it first thing. Installed
the new catalyst drivers from ATI for my GPU. Updated all my other drivers
(sound, wifi, etc.)

Ran the performance test. scored a 3 (it also states that i have an unkown
graphics card) but, i still can't enable aero. In fact not only can i not
enable it, but i don't have the option. It just doesn't exist, i can only
choose vista basic, there's no other options (except older windows choices,
classic etc.) and this is driving me nuts. I've searched everywhere i can and
i'm still pullin my hair out. It doesn't even list my video adapter under my
system information also some screen savers don't work, stating that i don't
have direct 3d. Oh and i really don't want to use the downloadable aero theme
either.

-please help i've already waisted 24 hours and i still really want to see
aero in action.