Just cause it hasn't been answered directly, yes you can do a clean install from a network drive. However, it requires either booting from usb with a minimal setup allowing network connectivity, (Bart's boot disks), or setting up your existing pc to allow it to respond to your netbook when it tries to network boot, both of which if you've never done it before can be a lot of effort for a single machine.
Jasper's usb dvd drive is a much better, and simpler, idea