From: http://mediarealm.com.au/articles/2013/03/remotely-enable-remote-desktop-in-windows-7/

Step 3: Change a registry setting to enable Remote Desktop
It’s time to make use of the Remote Registry and actually enable RDP. Load up regedit and 
go to File > Connect Network Registry. Enter the name of your remote computer and connect 
to it. Navigate to HKEY_LOCAL_MACHINE > System > CurrentControlSet > Control > Terminal Server. 
Change the value of “fDenyTSConnections” to “0”.

http://pcsupport.about.com/od/productkeysactivation/tp/windows-product-keys.htm

http://support.microsoft.com/kb/875350/

http://blog.atola.com/restoring-factory-hard-drive-capacity/