My thanks to HippyWarlock & mrcicp for their help with my question, before I try to begin the correction, I need to add something further, just to make sure I won't have other problems, to begin with, my computer was upgraded to a AMD Athlon XP 2000+, 1.67 GHz, 320 MB RAM, CPU 266 FSB 1677 MHz Socket A(10) after having installed a Plextor PX-708A Internal DVD+-RW/CD-RW & 8X DVD Combo Drive w/2MB Buffer.
I didn't know it at the time, that, when I tried to install XP Pro,( I was using Windows 98)I didn't uninstall the Norton AV and check for compatability, which was for NT only, that's when my problem's started with crashing, I took it to the shop that sold it to me and they wiped the drive and installed XP Pro, the system worked fine for sometime until it crashed again when the heater was turned on to warm the house, I use the PC in the loft area of my home and because of the high heat accumulation, I thought the crashing was because of a faulty CPU fan or the previous problem wasn't fixed at all! When I talked to the tech at the shop, I was told it was a virus and reformat, did that and it still crashed! With the help from someone I thought knew how to solve the problem by uninstalling the Roxio program for the CD/DVD drive, the system crashed again and I eventually got the Blue Screen message of a Physical Memory Dump, then we tried to repair that with using the repair function of the XP Disc, but, got another message of "Missing or Corrupt: windows\system32\config\system and I only got a short view of the words " won't start up!"
Not knowing what to do at that point, it was decided to install XP Home to see if that would start the system and it did, but, that's when I found out about the Real Player files in the Windows Media Player!
So, before I become more frustrated, what do I have to do to reinstall XP Pro to run my system the way it should be??