please help

I have a gigabye g41 combo motherboard,a dual coar Intel proccesor,2 gb of ram,a ati radeon 3600hd on my pc.i have installed a snow leopard 10.6.2 version on my pc on a partition of 30 gb and i do not know what to do so the pc would boot on the leopard partition.i tried many install options but it is the same thing..."succesfull install of leopard please restart" and after the restart it automaticly boots my windows xp

thanks in advance for any help!