Anyone know how to circumvent the admin when installing a game on PC

So, my husband left me one of his laptops while he is out of town so that my son could use mine for school and I'd still have a laptop to use. Unfortunately, there is a pin on it for the admin which my husband says I don't need. But I can't use the laptop for anything that involves gaming because I can't install any games. This means I can't play with my son now that school is out, or get the auto-update to quit interrupting everything I'm doing with messages that I need to finish installing the downloaded updates.

Is there something else I can do to install the games? What am I doing wrong? Do I really not need the pin to fix these issues?