Change Priority from hardrive disk to cd drive?

[Cruss]

Hi, I'm new to this forum.

I just recently bought a new computer.

Intel Viiv Technology
Intel Core 2 Duo Processor E4300, 1.8GHz
1GB RAM
320GB Hard Drive
Graphics Media Accelerator (GMA) 950
16X DVD+/-RW Drive
Windows Vista Home Premium

I want to change the OS to XP, but Vista won't let me downgrade my computer. I looked up some tutorials and I'm trying to dual boot them. I followed them step by step, but I'm stuck. How do I change my Priority from the Hard Drive Disk to the CD-R/DVD Drive?

 

[peterhuang913]

You can change it in the BIOS. Once you power the computer, you need to press a key. It is either F8, F10, DEL, etc. When you get into the BIOS, you can change the boot order.