No, that's why the password changes. Every time the computer is restarted, the password is changed so that I (or someone else) cannot log in.
Of course, Teamviewer is free for personal use. You can download more info at the official website.
At the bottom right there is a small window (not to be missed) when someone is connected to the PC. It also contains the person's name and his Teamviewer ID.
I'm just going to select the things i need to solve the problem. I won't go to your documents, pictures or anything else. You can also stay on the computer and watch everything I'm doing.