OK guys... success (I think). I went in to the doc's office, and the other XP computer had user_name AND password set, but the Win 7 (AC main computer) only had user_name without password. So I set the same password on the Win 7 computer, and went to Amazing Backup on the Win 7 computer.
In Advanced Settings > Change Logon, I used...
User Account: user_name
Domain: Win 7 computer name
Password: password
Nothing worked... tried using \\'s with \\computer_name\user_name, \\computer_name... no luck. But this time got the error occurred when changing account information, instead of cannot verify user account on domain.
So on the Win 7 computer, I changed the account type for user_name from "standard user" to "administrator". This time got the error that could not open ACAdminService service on computer.
So, finally decided to try to run Amazing Backup "as Administrator". Then, "amazingly", everything worked... the ACAdminService was updated successfully. Hopefully, I'll know tomorrow if the Scheduled Backup works (I didn't have time to try it, and also didn't want to mess with it for now). But the fact that I could change the Logon is very encouraging.
Thank you very much to all of you for all of your information.
