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I have an Acer laptop with Windows Vista Home Premium. How do I upgrade to Windows 7 Professional? And what is Windows 7 Prfessional N?

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According to the table below, you need a custom (clean) installation. I recommend you to run Windows 7 Upgrade Advisor.

Download and run the Windows 7 Upgrade Advisor to see if your PC is ready for Windows 7. It scans your hardware, devices, and installed programs for known compatibility issues, gives you guidance on how to resolve potential issues found, and recommends what to do before you upgrade.

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I personally do not recommend upgrading, a fresh install would be a much cleaner alternative. Backup your data and do a fresh install. You will thank me after you upgrade, run into problems and then do a clean install. :-)

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Its a European version due to Europe's laws

http://crave.cnet.co.uk/software/windows-7-n-the-n-editions-explained-49303415/

It all started with XP http://support.microsoft.com/kb/886540

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