Sound card problem + vista 64

Hello!
My first post in th :-)

After the release of cs4 and avid mc3 i decided to upgrade to vista64 .
I have two machines the one with m-audio 410 firewire and the other with audigy 2zs ppro.
Speakers on the one with creative are logitech z-5500 connected via optical.
And now the problem begins.
Creative and m have beta drivers for vista 64
I cant get 4 discrete channels when i do a speaker check in vista.
Like when i try to use surround encoder in audition 3 only two channels work (L+R)
Is there a way to fix this?

Thank you in advance !!


Ps. I know about the Daniel K drivers but i dont know if they will fix my problem or if it is safe to use them.