I have not gambled on Age of Empires 3 for a long time and now I wanted to install it on my new laptop, but I only have one CD and the product key. Is there a LEGAL way of somehow getting the game up and running?
Cracking (is legal as long as you can prove that you own this game -> the original game key, for example)
Nope. Either buy the CD again or you'll download it illegally.