Make your WINDOWS genuine

Open command prompt as ADMINISTRATOR.
Type the command

SLMGR -REARM

and then Restart the system after getting a popup message.\

Dats it...Your windows is now genuine....:)

To change the Mac Address / Physical Address of your computer

(Applicable whenever you are connected to a network)

To find the mac address or physical address

Method-1:

Go to Command prompt.
(To know how to go to command prompt, see the before post)

To open command prompt

Press “Windows key+R” on your keyboard and then type “cmd” in it and press Enter key.

To change the startup programs

Go to Run Window or pressing "Windows key+R" on the keyboard makes your work easier...;)