Using windows key on diffent type of windows?

Yes and no. You can install with his disc. If you are installing on a Macbook with a virgin bootcamp partition, that being that you have never had an install of Windows on that computer, your key will not work.

Install with your friend's disk, do not put in your key at the end of installation. Instead, complete installation and open Windows 7 (it will be in "Trial Mode"), complete the steps in this tutorial:click here, restart, open Activate Windows app, enter your key and you are done.

This is the method I used to great success!

 

Enjoy.

(Digital River instructions)
http://drh.img.digitalriver.com/store/mswpus/ContentTheme/pbPage.Upgrade

(ISO. Don't know if its home or pro, probably pro. Contact them for home)
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65733/X15-65733.iso

 

Heck I wouldn't know; I ordered mine from MS and got the retail copy, which I'm backing up right now Haven't been this excited for a windows os in...ever? haha