vista not install motherboard issue

I have a Asus P4R800-V Deluxe motherboard and i am trying to install Vista public beta 2 on a formatted single 120gb sata HD not raid configured booting from the vista dvd.
1) If i enable sata in my bios and have my agp GFX card (Asus AX800XT 256mb platinum) plugged in Vista will boot off DVD it gets to loading windows then i get a black screen and have to reset pc.
2) If i disable sata in bios and have my GFX card plugged in Vista will boot off DVD load windows files i click install now enter my product key, it gets to the which HD do you want to install vista to list, but as sata is disabled in the bios my HD can not be seen so obviously can not install vista.
3) If i enable sata in bios and unplug my GFX card, vista will boot off DVD load windows files, i enter product key it gets to the which HD do you want to install vista to and my HD is in the list i select my HD then click next it will start copying windows files, It will the lock up during copying windows files or expanding windows files and i have to reset pc.
All in all i think it could be an incomatability issue with my motherboard ie the chipset or the sata chip.
Any help would be great!