start -> run -> regedit
make a backup, if you want.
look through the list of subkeys (0000, 0001, etc)
DriverDesc keyword will tell you which network adapter. For example, “NVIDIA nForce Networking Controller”
when you find it, right click and add -> new -> string value
Value Name: = NetworkAddress Value Data: = your new MAC, with no space or : For example, 0019DB71C830
ipconfig /release ipconfig /renew ipconfig /all (to verify the new mac took)
Now your a l33t Winblows H4|<3r! If you want to go back to your hardware MAC, remove the NetworkAddress key and restart the interface. FYI, in gnu/linux follow these simple steps to change your MAC address
ifconfig eth0 hw ether 00:19:DB:71:C8:30
if you get this error
SIOCSIFHWADDR: Device or resource busy - you may need to down the interface
ifconfig eth0 down
and try to change the MAC again.