This is the instructions for installing but I don't have a driver's section can someone direct me to drivers to install on XP for a 7520 ?

Modem Driver Install
If you installed a recent version of BlackBerry Desktop that came with a 7100t, 7290, 7250, or 7520, it should include modem drivers and already be automatically installed. In the event you need to manually install them, the modem drivers should be located in this directory:
C:\program files\Common Files\Research In Motion\Modem Drivers
However, if you are having problems with these drivers, uninstall, delete all leftover RIM files, and then reinstall the latest version of BlackBerry Desktop

That's a great question. I just printed the directions and was going to give it a try tonight. Where can I find the T-Mobile drivers for my 7105t?

Download the BlackBerry Device Manager (6.15 MB) or BlackBerry Desktop Manager (33.4 MB) to get the modem drivers.