Issue with Audio Interface with "Intel-Based Mac"???

So, today I went ahead and purchased the M-Audio Fast Track Pro. Installed the drivers and it was pretty quick. Got a guitar part and vocals recorded. But I tried to go into the system preferences for the M-Audio unit and get this:

"You can’t open M-Audio Fast Track Pro preferences because it doesn’t work on an Intel-based Mac."

WHAT THE HELL IS THAT?

I went to the M-Audio Web site to see about updated drivers but theres a bunch of options. I know I have OSX 10.6.3 but I dont know if its 32bit or 64bit.
How do I find out?
Sorry guys, im new to the Mac game....

 

I downloaded the driver upgrade from M-Audio and I was able to open the preferences for the unit.

Says max Sample rate is 48Khz, but the box says max is 96Khz. Any Idea why? Is garageband not capable of 96Khz or what?

Also, I exported a song right quick to iTunes (electric guitar using an amp model) and a vocal track out of my Blue Bird condenser mic.
It sounds dull and low. Any tips to adjust the final mix? Is there like a "mixing room" ?