Well, the HDD of the PC was not working anymore, so I had to install a new W7 version (Integral version) using an .iso on a new HDD. And I don't have the original disc with me.
If I get it right, for my particular case, what you're telling me is that the only solution is to buy another W7 ? What if I upgrade to W10 ? Would I still need an activation key ?
Aren't there any other way to make it work without buying a new W7 copy ? (sorry if I misunderstood what you told me)