Problems with Asus
 

So, I've been trying to dual boot Windows Vista and Leopard, using iATKOS i5.
But when I attempt to load iATKOS the gray screen with the apple logo pops up for a second or so, and then disappears, and my computer restarts, loading windows vista.

I'm using an Asus F80L with Intel Pentium Dual Core T2390 1.86 GHz, 3 GB RAM and 250GB of storage

I don't know what I'm doing wrong, I'm hoping you guys will know, you seem very knowledgeable