I want to change mac address but Windows 7 does not allow you to change second nibble to desired value

[Vexxum]

So there any way to downgrade my wifi adaptor to xp.
And will it allow me to change mac address as i like....

 

[RealBeast]

While not quite as flexible as XP, you can change the MAC address within limits like THIS. You can obviously downgrade your entire OS to XP if all drivers you need are available, but you cannot just run the adapter in XP.