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If your Windows 7 is an OEM version, you might not be able to reactivate it, at least not without phone activation option.
It might be you are not allowed to activate your OEM copy of Windows on another.
This warning is published in the tutorial he mentions in original post ( Windows 7 Installation - Transfer to a New Computer Warning Using this method causes Windows 7 to lose all activation information, and it needs to be reactivated afterwards.
Kamrul08 # 4 Kari All other activation methods would be against the End User Agreement (eula).I got the software from msdnaa when I was in the PC support program.I collect my product key from previous laptop and tried to activate with.Your best shot is to try phone activation: Activate Windows 7 by Phone Kari My System Specs Computer type Laptop System Manufacturer/Model Number HP envy 17-1150eg OS Windows 10 Pro x64 EN-GB CPU.6 GHz Intel Core i7-720QM Processor Memory 6 GB Graphics Card ATI.But it shows the massage bellow.The data is still copied to the clipboard for pasting to your response.Transferring an OEM image is tricky, often impossible.The only valid way is to activate as Windows should be activated, entering the product key, and if it does not for one or another reason work contact Microsoft by phone.I missed to read the warning above.