I bought a new notebook that came with Win7 Home Premium. I know want to sell my home premium license and buy a profesionell one. Is it possible to just change the key in my current running and ready-configuerd win7 home premium, or do I need ti reinstall the system? Thanks for your help!
You can just do an upgrade, you can keep all your settings and programs. All you need is the new license key and to follow the steps in Windows Anytime Upgrade.
On your PC, open Windows Anytime Upgrade (click the Start button, type Windows Anytime Upgrade into the search box, and then click Windows Anytime Upgrade in the list of results
Follow the instructions on the screen that come with your upgrade key