I received a new laptop (Dell) with Windows 7 Home Premium installed (with an OEM key sticker on the computer). Is this key already activated/locked to the laptop motherboard? I ask because I have a retail copy of Windows 7 Professional and would like to use it on this system, and wish to use the Home key on another system. The laptop has not been turned on, can I use this key on another system? or is it pre-locked to the new laptop?