How come when i plug my samsung behold phone into my computer using a usb cable, it dosen’t work?

I have a samsung behold buzz, and my carrier is T-mobile. I have a Usb cable and i plugged it into my computer and it says that i have to install something. But what do i have to install? My brother’s buzz is just like this one, it is a Samsung eternity. And it works just fine when i plugged it into my computer, and he didn’t install anything. But his buzz carrier is At&t. But…what do i have to install?

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