If your current copy of Windows 7 is an OEM (System Builders) version that came with your current computer, or is an Upgrade version purchased for that computer, it is licensed to that computer and you cannot legally transfer it to your new computer. You MUST buy a new license for the new computer, or else it is stealing. Read your EULA
. It will say something similar to the following, which is for Windows 7 Professional (their bold
By using the software, you accept these terms. If you do not accept them, do not use the software.
The software license is permanently assigned to the computer with which the software is distributed. That computer is the “licensed computer.”
The software may include more than one version, such as 32-bit and 64-bit. You may use only one version at one time.
It is important to note you do not own the software, you own a license to use it. And note this is an industry policy, not just Microsoft's.