Win XP Installation error

Hi Guys
I have a problem, and I’m about to pull my hair out as its not going away !!!!!!!!!!

Basically trying to format the PC and put winxp pro on it.

I format the hard drive using the installation CD, it copies the files over on the HDD, then after it reboots to go on the next stage for the installation, this error comes up:

NTLDR: Couldn’t open drive multi(0)disk(0)rdisk(0)partition(1)

Ok this is wot Ive tried:
1) replaced HDD
2) replaced RAM
3) tried diff CD’s
4) formatted HDD over and over
5) changed the CMOS battery
6) cheked the BIOS settigns, its on factory default and seems fine

Also, its an old PC, but it was running XP fine on it before.

Help.

Andrew