Are you positive there's no local disk? It doesn't have to be (C:), it could also be (D:). Every computer to my knowledge has one, the local disk is a computer's hard drive where every downloaded program stores its files.
So when you open your file explorer, you don't see anything like this?
(http://image.prntscr.com/image/7d1056ca55cc43ac853f3579b4fcc933.png)