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How to change MAC adress of your network cards :

Press "Start" -> "RUN" -> "regedit" -> to start Registry Editor. For safety do not forget to make a copy of your registry.
Find a key :
"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\
{4D36 E972-E325-11CE-BFC1-08002bE10318} You will find underkey : like "0000", "0001", "0002" . You have to check all underkey (start from "0000") and you have to find your Ethernet Card it will be in this key "DriverDesc"

When you will find your key Press Right mouse "New"-> "String Value". Put the name "networkaddress" and press "ok". Click twice on this key and put 12 hex. It will be you new MAC number. For example "00C095ECB761".
Restart your machine.