Please help

Hello all, i cant get my computer to boot more then 5 seconds after i put the 10.5.2 r2 disc in.
it tell me to hit any key to continue or F8.
when i do any key it just loads then goes to the grey apple screen for hours
when i do-v it loads for a second then freezes for hours

Mainboard is Motherboards MSI K8NGM2-FID nVidia GeForce 6150 Chipset
AMD Athlon 64 3500+ Venice processor
IDE DVD-Rom
(2) SATA HHD 500GB and 250GB
On Board LAN and Graphics
Sound Blaster X-Fi Sound card
USB Mouse and Keyboard

I am try to install the OS X on the entire 250GB SATA HHD

Thanks,