My 7 year old PC's HDD crashed last night. It won't boot. I had upgraded it to Win10 a few months ago. I will replace it with a new SSD. I intend to create a Win10 bootable USB drive from my laptop. What happens to the license activation? I bought my PC from HP with Win7 on it, and it still has the sticker with the product key on the side. Is that enough for me to activate Win10 on it?

Just download and reinstall Windows 10, it will automatically reactivate within a few days. How to download official Windows 10 ISO files http://answers.microsoft.com/en-us/windows/wiki/windows_10-windows_install/how-to-download-official-windows-10-iso-files/35cde7ec-5b6f-481c-a02d-dadf465df326 then How to: Perform a clean install of Windows 10 http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-do-a-clean-install-of-windows-10/aef0ae63-2117-41ee-a8ea-4a3181625b08 When prompted to enter a product key: Click Do this Later. Windows 10 will reactivate automatically.