Upon installing the beta on my computer, I get "d3dx9 42.dll is missing"
Windows 7 home - 64 bit
Intel Core 2 DOU e8400
2 gig ram
NVidia GeForce 9800 GT
Ironically, I did not have this problem on my laptop with is i7 4 gig windows 7 32 bit.
I suspect it has to do with home 64bit, but that is pulling a guess out of the nether regions behind me.