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I built a new PC and installed Windows 7 Ultimate Trial and all the necessary apps (Firefox, MSE, Skype etc..)

I then purchased a serial and tried to activate it. I got an error message saying the serial is for a different version of Windows 7 and got clarification that the serial number is for Windows 7 Ultimate N.

Does anyone know how to change my installed edition of Windows 7 Ultimate to Windows 7 Ultimate N, the difference between the two editions are so small (according to Wikipedia) that I would hate to have to start all over again.

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What @Diago said. On the bright side, Easy Transfer Wizard will help you back up your settings. – Randolph West Mar 4 '11 at 17:26
Since the price is the same for the N and non-N versions, contact whoever you purchased the serial number from and and exchange it for one for the version you have. – martineau Mar 4 '11 at 19:35
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up vote 11 down vote accepted

Unfortunately you cannot change an N edition to a Non N edition or the other way around. It requires a re-install since the SKU's are different.

The major difference is that none of the Media Player components are installed, not even at kernel level, and Microsoft actually makes a different build for the N editions.

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ah ok, thanks very much for your help and responding so quickly. – fernandose Mar 5 '11 at 12:14
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I doubt it will work but it's worth a shot: can you try the "Windows Anytime Upgrade"?

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This won't work because it's already at Ultimate level. I don't even think this option is available on Ultimate. – Randolph West Mar 4 '11 at 18:19
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