Windows7 Premium to Professional

I have a pc with Windows7 Premium installed on it. I also have a version of Windows7 Profesional on disc (complete version not upgrade). What is the best way to get the profesional release on my pc running : clean install or will the premium system propose an upgrade? If an upgrade should be possible, is all my data and existing programms of then deleted?


Essential Member
Clean install,. no question about it.

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