Alienware Windows 7 disc on 2nd pc...

Hi,

I have an Alienware laptop which came with a windows 7 disc, today I get the last bits for a gaming desktop I am building, but only have the windows 7 disc that came with my laptop. Can I install that disc on the desktop as well as it already being on the laptop?

I'd better add that the desktop isn't Alienware.

Thanks in advance.