Hi i want to run Mac OS on my computer plz help..

My comp. specs are

processor--amd phenom 9500

motherboard--Asus M3A (am2+ support)

hardisk--WD 320 gb SATA

graphics card --XfX Nvidia geforce 8600 GT 256 mb

ram--2*2 Gb transcend ddr2 667mhz

After some googling i downloaded Mac OS X-Leopard10.5.1

but on installation error came

"Still Waiting For Root Device"

Plz tell me is my hardaware compatible to run mac os

and suggest any other version or patch of mac ???