Weird Vista Install Problem

[mudogramx]

Hello, I'm new to the forums. I just built a new system last night. It was quite successful, just a few snags here and there. Anyway, I'm having trouble getting Vista Home Premium x64 to install. Neither Vista or my copy of XP x64 will even allow me to do anything unless I change my SATA mode to compatibility in my BIOS. I either get a hang or a blue screen of death 7B which is a driver problem I think. I have an ASRock P45R2000 Motherboard. I can get past the screen where it says Vista is loading files. I then get the black screen with the green bars moving back and forth. I am then presented with a blue screen which I know is the basic Vista background for installation. I get a mouse pointer. After hanging for a minute or 2, which I find odd, I can begin the installation process. However, every time I click next it takes almost 4 minutes or more to move to the next step. Regardless, I am able to format my HD and begin the install. The install hangs at the expanding files step. It usually gets anywhere from 21-27% complete before it hangs. I even let it run all night just in case since I've read about similar problems. Any ideas? I'm stumped. I've even loaded my SATA Drivers prior to install.

Specs:
ASRock P45R2000 Mobo
Core 2 Duo E8400
4GB DDR3 10666 RAM
Radeon 4850
Seagate SATAII 500GB HD
Samsung SATA DVD-RW Drive
CoolerMaster Real Power Pro PSU, 550 Watts

Thanks!