Windows 7 Enterprise Dual Monitors Issue

I hooked up dual monitors using an HP DisplayPort to VGA adapter. Both monitors are on. I see a duplicate screen.

I went to the Display section of the Control Panel to extend my screen, but only 1 monitor is detected.

Following Microsoft's suggestions along with other forums, I restarted my computer twice and also unhooked the cable and hooked it back up. Neither of these suggestions work.

This is how I have it set up -

1. Main monitor hooked up to the HP DisplayPort. DisplayPort hooked into the computer via what looks like a type of USB connection. (I am not good with technical computer terms!)
2. D-Sub cable hooked into second monitor and hooked into computer via D-Sub connection.

This is a PC for work, and I work from home - almost 2 hours away from employer. I am unable to alter anything in the actual PC. I hope there is a fix I am able to do.

Thanks!