[SOLVED] Some XUID information. And I need some help..

Okay so today I went on my mom's computer and tried to play MW2. Good news it works(as I was banned on my computer). Bad news is she doesn't let me use her computer a lot. So before the alteriw update 1.3.37a was out you can change your mac address which has to do with your network, which no longer works(for me anyways). Well with the new update it has to do with your computer information. So is there a way to 'spoof' alteriw into thinking I am on a different computer?

Edit: My bad the MAC is on your computers registry.. But still is there a way to spoof the computers informations?

Edit2: Will installing/reinstalling a different Operating System change my MAC?