I'm trying to install Snow Leopard (iDeneb) on my Laptop, I'm stuck at the apple logo screen on first boot and the system restarts.

My system specs are:

Toshiba Satellite L650
Windows 7 32 Bit
INTEL i5 CORE 2
4 GB RAM
ATI MOBILITY 1 gb graphics card

I'm new to all this and am unfamiliar with the values/what settings I need to change etc. Please help