Getting errors about an invalid product key during the installation of Windows 7 it is possible for the following reasons.
A mistyped key. Try the key again.
You may be using a key that does not match the version that is installed on your computer, Windows 7. Verify that the product key is for an activated version.
The product key is to an upgraded buy windows 7 pro product key version of Windows 7, but a previous version of Windows is not installed on the computer when you install Windows 7. To install an updated version of Windows 7, your computer must be running Windows Vista or Windows XP. If before installing the hard drive has been formatted, use the updated version of the product key to activate Windows 7 is not possible. To activate Windows 7 professional, you'll need to install a previous version of Windows 7 pro key, and then reinstall Windows 7. For more information about activation, see. on the Microsoft Help and support Web site.
We recommend that you install Windows 7 when running the current version of Windows. To format the hard drive if you are using a version of Windows 7 to upgrade, start the computer by using the Windows 7 installation disc or USB flash drive, select custom (Advanced), and then click drive options (Advanced).
Check the product key can be on a sticker with the product key on a computer or Windows product packaging, as well as in the confirmation email, if Windows 7 was purchased and downloaded online. Visit the Microsoft website to see examples of product key stickers.
If the product key is still not found, perhaps for Windows 7 home product activation will have to purchase a new key. You can purchase an additional copy of the similar release of Windows 7, which contains the Windows 7 Home Premium SP1 32-bit Product Key available for use.
If the error message is displayed each time you enter a product key, you can leave the box empty and click Next. When the installation is complete, but your copy of Windows 7 will not be activated. You must activate Windows within 30 days after installation.
When using unlicensed copies of Windows product key will be invalid. For more information, see. in the section of a licensed copy of Windows
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