Hi, I just built my first pc from scratch. It booted but the screen now shows the DOS prompt of A:\>. How do I load my OS from here? I have the old XP disks from an OTB machine, and i had written a bootable cd using iso builder and nero burning. thanks for any help.

If you have the image burned to a CD, double check the boot prioreties in the BIOS. After thats all sorted, just pop the disk in, reboot and follow the directions...