By default, all local users are presented in the Authorized users list unless they belong to the Guests group. If legitimate accounts do no appear in this list or in the list displayed when clicking on the Add button, tehe are two things that you could check in Control Panel | User accounts:
1. Check whether the account type is not Guest (XP Pro).
2. Check whether the account type is not Unknown.
In both cases, change the user type to Limited (not to Administrator anyway) and restart PC TimeWatch. The users should now appear in the Authorized users list or in the list displayed when clicking on the Add button.
Also, please note that renaming an account through the simplified User Accounts interface of XP Home or XP Pro in the Control Panel can lead to some confusion. If you rename an account this way, the account name is changed only in the login screen. The system (and PC TimeWatch) are still "seeing" the old name. For example, if you have initially created an account as John and if you have renamed it to Bill, you will see Bill on the login screen but PC TimeWatch will still use the original name (John). So you may have the feeling that PCTW is not seeing this account. But actually, the settings specified for John will apply to Bill.
Equipe Support PC TimeWatch