Yeah not sure exactly what they are using to ban but I guarantee you it is more complicated.
There are things call mid macid cpuid biosid and even possible location.
These things are not as easy to bypass. Some are parts of your hardware. also windows serial numbers in some of their program.(not your cd key)
All of these things can mixmatch later as well meaning even if you changed them all its likely the database has cross referenced them to possibly confirm 99% that it is the same person.
Best bet go to a cafe until they start finding out you have been malicously changing their computer interface which is against many laws too.
Point being just changing this value will not hide you. If you 'get away' with it it means they did not care that much if you broke the ban. TQ would just like people to think they can.
Good luck.