Opening Windows Wider

Hello, tech support. May I help you?

I hope so. I have too many files and have to delete some. But I don't know how.

What do you mean you have too many files?

I don't have anymore room on my PC. It's packed.

Well, according to our records, it is only a couple of months old. Have you installed that many programs?

I only have what came with the computer. I want to put more in but the box on the screen is full. How can I delete some things?

If you will, please click once on the middle button in the upper right hand corner of the box on the screen. It's between the minus sign and the x sign.

Okay. Wow. Look how big the window got. I guess there is some room left. Thanks.