Booting to old Dell install of XP with Asus

I just bought almost a new computer, with the exception of my old hard drives and dvd drives. It's got an Asus A8N Nforce4 chipset mobo and an Athlon 64 X2 4400+. After building it, I started her up and the bios ran fine, detecting everything as it should. However, when it got to the part of the process where it should boot to my master hard drive(a hard drive I bought a while back and put in my Dell computer, installing Windows XP with my Dell XP cd), it simply stopped, and there it stayed. I played around, and can boot to cds just fine, but not to my hard drive. I tried to boot to the Dell Windows XP cd I had, but apparently it detects that it's in a non-Dell system and refuses to run.
Any ideas why I can't boot?

 

You probably need to format the hard drive as the new system is not compatible with the OS on the drive. You are going to need a plain old XP cd by the looks of it.

 

Alright, looks like I can get XP home OEM for around 90 bucks on Newegg, I guess I'll do that ><

 

That would be the best bet.

If it is not XP SP2 download service pack 2 & slipstream it with the XP cd. All updated in one load.