That only works for some people.
This works for some others:
I take no resonsibility what u do with it!
1. Go to start-> run-> write "cmd" and press enter -> write "ipconfig -all" and press enter
2. Find your MAC adress (the one with numbers and letters in it) eg: 00-15-0A-EA-F1-01 Copy and paste it to notepad and modify it to look like this: 00150AEAF101.
3. Right click on My computer and choose Properties. Now go to Hardware -> Device manager and Network adapter card settings. Then go to the line Network Adress. You can see that its set to Not present. Click on the upper one and copy paste the MAC adress you found earlier ( 00150AEAF101 ).
4. Thumper changed the 3rd and 4th number in his method but I wouldn't suggest that since I've read it could mess up ur ethernet card. You could try this instead 00151AEAF101. You can choose any number between 0 and F (F = 16).