They banned us on our main HDD
Changing IP or MAC address will not work
I got some friends who formated their main HDD and install W8 ( they had W7 before ) ...They were able to bypass the ban
Another solution is to create a virtual hard drive , install OS and GRP on it .
But you must know how to make it off from your main hard drive ...Creating just a vhd will not work ...you must create a virtual bootable drive/partition