Thanks to all of you for taking an interest in my problem
Rather than reply to each of you, I'll explain what I did. I still suspected the software sent with my original drive was corrupt (that's why I returned it) and remnants remained. I had used ADD_REMOVE programs and used the Explore option of My Computer and found nothing. I decided to use SEARCH of all files & folders for "Maxtor". I don't know where it was hidden but the main folder and three subfolders came up. I deleted the main folder and all disappeared!
After rebooting, I tried another install and it went through all the way to registering the drive!
I tried a backup & nothing happened.
I tried a back up called "Safety Drill" which is supposed to backup the complete C drive but got "Image created with errors"
I checked the Backup Log and it showed zero bites recorded. Unless someone has some ideas, I guess I'll have to spend time this weekend trying to get through to Maxtor Support.