If erasing Windows of existing machine and put to new one, what to do?

Hello,

I have another Windows 7 installed on another Mac via bootcamp. If I am going to erase the Windows partition of this machine and install Windows 7 on another computer, do I need to contact MS to break the tie between Windows 7 and existing hardware before I can install Win7 on a new Mac with authentication?

What are the procedure? As far as I recall, in XP time, we needed to call MS when we changed machine.

One thread on this same subject wasn't good enough? See my reply to your original thread. You can't call Microsoft and have them remove the Windows 7 activation associated with the old computer. The safest thing to do is attempt to install and activate Windows 7 on the new computer (assuming a retail version of Windows 7). If it doesn't activate automatically over the internet, then you can call the activation line and tell the computerized voice that it is installed on one computer when it asks you. If you wait until you install Windows 10 and attempt to activate Windows 10 by entering the Windows 7 product key, and it is blocked from automatic internet activation, then you are stuck until you go back and install Windows 7 and use the phone activation.

simrick said:

If it is a retail W7 key, I believe you can run an administrative command prompt and type

Code:

slmgr /upk

to de-register/uninstall the product key, before wiping the partition. The W7 retail key should then be used with the W10 install, to activate.

You can also activate in an administrative command prompt by typing

Code:

slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

Those commands only affect the local machine and do nothing to alter the information stored on Microsoft activation servers.