Does the laptop come with a full version of Win7 or is it a pre installed version? Am I better off installing a full version?
Pre installed, newly released GT60 come with Win8. Why should you be better off with installing another one? It is a normal Windows that has the same features like a Win7 Home Premium/Win 8 you buy seperately and install.
can I just use that disk with the win cdkey from the o/s that comes with the laptop to install the full version, or do I have to go out and purchase a new Win7?
If you have a Win 7 DVD you should have a key anyway. None the less you don't get a separate key for the pre installed-OS so no. If you have no valid key for your Win7 on disc you'd have to buy another Windows if you don't want to use the pre-installed OS