hard disk driver missing vista 64

I'm having the Asus A8N-SLI SE mobo, trying to install the latest Vista 64Bit Beta. After entering the serial, I'm being ask for a driver disk to submit the hard disk driver - we know this already from WinXP installations - only, that this time none of the drivers I could find on my CD or on the Silicon Image website work (it's a SIi3114 chipset). I'm just using one SATA drive, no RAID.
Many of you must have a similar setup, which I imagine is very commone, so how did you do it? Which driver did you use?
And to Microsoft: why is the BROWSE button unusable? At least I would like to browse a CD rather than copy stuff onto my floppy disk (how old fashioned!) with every new attempt. Takes so much time!!!