g.Go through each subkey that starts with 0000.  Click on 0000, check DriverDesc keyword on the right to see if that's the NIC you want to change the MAC address.  The DriveDesc should match the Description you recorded from step (a.-I.).  If you are not 100% sure about the DriverDesc, then you can verify by checking if the NetCfgInstanceID keyword value matches the GUID from step (c). 
If there is no match, then move on to 0001, 0002, 0003, and so on, until you find the one you want.  Usually 0000 contains the first NIC you installed on the computer.
In this demonstration, 0000 is the NIC I selected. (See figure 3.)

h.Once you selected the subkey (i.e. 0000), check if there is a keyword "NetworkAddress" exist in the right side of the window. (See figure 3.)

I.If "NetworkAddress" keyword does not exist, then create this new keyword:

i.Click on the drop down menu “Edit -> Add Value”.

ii.In the Add Value window, enter the following value then click OK.
     Value Name: = NetworkAddress
     Data Type: = REG_SZ

iii.String Editor window will pop up at this time  

iv. Enter the new MAC address you want to modify.  Then click OK.
        (There should not be any "-" in this address.  Your entry should only consist of 12 digits as seen in the figure 5.)

II. If "NetworkAddress" keyword exists, make sure it shows the keyword type is REG_SZ, and it should show as NetworkAddress:REG_SZ:  .  This keyword might not have a value at this time. 

i. Double click on the keyword NetworkAddress and the String Editor window will pop up. (See Figure 5.)
ii.Enter the new MAC address you want to modify.  Then click OK.
        (There should not be any "-" in this address.  Your entry should only consist of 12 digits as seen in the figure.

j.There are 2 ways to make the new MAC address active.  Method I does not require a system reboot:
I.Goto Start->Setting->Control Panel, and double click on "Network Neighborhood".
    WARNING: Make sure you understand that you WILL lose the network connection after completing step "ii." below, and
    if you have a DHCP client, you will get a new IP address after completing step "iii."
i.  Select the Network Adaptor you just changed the MAC address.
ii. Right click on the selected Network Adaptor and click "Disable." 
    Verify the status column for this adaptor changes to "Disabled"
iii.Right click on the selected Network Adaptor and click "Enable."
    Verify the status column for this adaptor changes to "Enabled"
iv. If for any reason it cannot be disabled or re-enabled, you have to
   reboot your system to make the changes effective.
II. Reboot your Windows system.
k. Once completing step j (if rebooting the system, wait until the reboot is completed), go to command prompt, type “ipconfig /all” to confirm the new MAC address.

Restore The TRUE Hardware burned-in MAC Address:
   1. Remove the entry you added:
       I.  If you followed Method 1, then go back to the advanced properties window and remove the entry you add.
       II. If you followed Method 2, then remove the "NetworkAddress" keyword you added in the registry.
   2. Use step (j) above to activate the change you make.
   3. Once rebooted, go to command prompt, type “ipconfig /all” to confirm the original MAC address.

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