Blue screen appears and system restarts

Hello,

I have a HP Workstations Z400 PC with Windows XP Professional. Recently we were using the PC and it froze. We rebooted it and as soon as the Windows XP flash screen appears a blue screen appears (flashes) very quickly and the computer reboots. The PC would beep 6 times times, pause, beeps 6 times, etc. I found out that this was a Video Card issue from a HP forum website. After replacing the video card the computer no longer beeps, however the blue screen keeps appearing and restarts over and over.

I have tried Safe Mode, Last Know Good Configuration and none of these work

I have tried the Windows XP CD and entered recovery console. CHKDISK, FIXBOOT, neither woked.

I tried removing RAM, did not work

I installed a new hard drive on the PC and re-loaded windows XP and it works just fine ! So I don't think my MB is an issue, nor the RAM or other hardware components.

However I want to still fix the old hard drive because I have all of my work information on it.
If I connect my old hard drive as a 2nd hard drive, I am able to see it when the computer boots up the new hard drive. So yes I can copy all of my data. But again I sure would like to fix it becasue all my programs and software that I've set up is still on the old hard drive.

My guess is that there is a corrupted video driver on the old hard drive but since it will not boot up with the old hard drive, I don't know how to clean it up. I have the ability to see all the contents on the old hard drive though. Any ideas ? Thanks !!!!!!!