Ahhh finally some answers....
Have you tried the XP Boot Floppies. Sometimes machines just will not boot properly from the XP CD, but will access it fine if you use the floopy set to prep the HD, and start the installation.
As said by someone else recently, certification doesn't mean anything on these forums, just because some of us are less qualified doesn't mean we have any less valid opinions.
Also if you had posted the things you had tried earlier in this thread, people wouldn't have bothered to suggest them.
It means that you know about computers and would have tried the obvious things when diagnosing your issues. Of course, we all made an assumption that you were a newbie, but that is obliously not the case, which I believe is exactly what you are making clear by informing us a little of your background. And yes, a little more info in your earlier posts would have been helpful.
Noted for future referance
OK I Got a new mobo and xp installed SWEEETT!! untill i plugged my network cable in and crashed my damn pc again.....
Still working on it though
OK Guys Problem Finaly Solved
After virus scans, new HD,new mem, ,new mobo different copy of xp i replaced the processor and BANG XP Installed In 11 MIns