Windows Activation FAQ: How do language, version, 64-bit or 32-bit, and source affect ability to installer and transfer Windows licenses?

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*We get beaucoup de questions on Super User about Windows activation and licensing. This question is an attempt to answer the most common questions in one place with a [canonical answer](http://blog.stackoverflow.com/2011/01/the-wikipedia-of-long-tail-programming-questions/).*

When reinstalling Windows, the following questions often come up:

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Puis-je **transfer the copy of Windows** from my old computer to a new one?

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Does the license key on the **sticker on my computer** work on any computer?

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If J'ai un **32-bit** version, **can I install a 64-bit** version?

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J'ai unn **OEM version** of Windows, but only a retail disk. Puis-je still use it?

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Je veux install Windows with a **different language**. Do I need a new license in that language?

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I **changed some hardware**. Will I be able to reactivate my computer?

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Puis-je **back up my activation** before doing a reinstall?

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**How many computers** can I install my license on?

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Do J'ai to **deactivate** my old installation before transferring a license? If so, how?

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**Comment fonctionne licensing work** in Windows ?

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Quels sont les **restrictions** on transferring, reinstalling, and changing versions of Windows?

[ForumBot]

***Disclaimer:** this information is not guaranteed to be correct. When in doubt about licensing, contact Microsoft's activation hotline for assistance. Super User is not responsible for legal repercussions resulting from your choices with licensing and activation. For more official information from Microsoft, see the [Microsoft Product Activation Solution Center](http://support.microsoft.com/contactus/cu_sc_prodact_master).*

## Overview: how can a license be used?

A single Windows 7 license can activate several different types of installations. Here is a quick reference table of what is supported:

```
License type | OEM | Retail | Upgrade | MSDN | Vol. License