It seems like you are facing multiple issues on your Windows 7 system, including password problems, error messages while creating user accounts, and encountering issues with setting passwords. Here are some steps you can take to troubleshoot and potentially resolve these issues: 
1. Resetting Administrator Password:
 If you are unable to reset the administrator password using traditional methods, you can try booting into Safe Mode to access the built-in Administrator account and reset the password from there. 
2. Fixing Invalid Characters Issue:
 When creating a new user account, ensure that you are not using any special characters that Windows might consider invalid. Stick to alphanumeric characters without any symbols or...