George_Z :
Soph, Thanks very much for the info. I have left the WD drive at home and do not recall the type it is but I am certain that it was made in 2014. Earlier this morning before coming to work I used a bootable partition manager, MiniTool Partition Wizard, and recovered a lost/missed partition named Boot. Then I tried to boot from the WD hard disk but unfortunately I got a message on a black screen that file hal.dll is missing or is corrupt in boot folder\system32. I will search around to see if I can locate such a file from WinXP SP2 OS and copied in the system32 folder by connecting the WD disk in an enclosure to another PC. Meanwhile I downloaded the WD alignment too and will try that before I do anything else.
That's great, George!
As for the boot problem, it might be something wrong with the cloning process itself. Do you have the WinXP SP2 installation disk?
If you do, I'd recommend performing a clean install instead of cloning. Don't worry about the product key, it should work since you are using the same computer. Let me know as soon as you run the WD Alignment tool.
I really hope this works out for you!
SuperSoph_WD