For fear that the 500 Gig SATA might have gone defective, I installed it on the CPU that has a 250 Gig SATA with Win XP OS. When I started the one with XP, it went to CheckDisk mode on the 500 Gig SATA. It corrected all the disk errors.
When I installed back the 500 Gig SATA to its original computer it booted normally with Windows 7. It first showed "Launch Repair" with "Open Windows normally" and I opted for the latter. Yes, it booted normally with Windows 7 with no problem at all. This simply shows that Windows XP is far superior to Windows 7 as it was able to fix what the Windows 7 installer CD could not.I hope that Microsoft will continue supporting Windows XP as it shows to be a support for succeeding Windows OS that could not fix their own problems.