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Your computer manufacturer may include an update certificate with your qualifying purchase. Windows 7 Upgrade form
If your computer was preinstalled with Vista Home premium, Vista Business, or Vista Ultimate and distributed on or after 6/26/09, and had no forms included, check with your computer manufacturer to see if your PC is part of the Upgrade Option Program. If so, you should follow the manufacturer’s directions for getting your Upgrade.
If your computer manufacturer has not included a form for the upgrade, and you purchased your computer in the qualifying time period, you need to find out the details for getting the upgrade directly from the manufacturer. On Microsoft's Windows 7 Upgrade Option Program site, you can find links to manufacturers who are participating in the program, to learn what they require. An additional article will cover details for obtaining the upgrade directly from PC manufactures if you cannot get it directly from Microsoft.
Microsoft does say: Not all PC manufacturers are participating in this program. Some are participating but may have an unusual or unique way to get and fulfill the Windows 7 Upgrade requests.
To submit the form for claiming your upgrade, go to the Windows 7 Upgrade Option site. On your offer form, there will be a 17-character code. You can use the option on Microsoft's site to have them read your computer and determine which Windows 7 Upgrade your computer needs. Microsoft says check that the edition displayed is your actual operating system before submitting your order.
If you want to find the information manually, check your operating system: Start -> Computer -> Properties -> Windows editions ->. Your operating system will display the information on your operating system on your computer. Also check on that page in System type and verify 32-bit or 64-bit on your computer is what is on the offer form.
Microsoft does advise you back up your system before upgrading. They warn: If you attempt to upgrade to a non-matching version of Windows 7, the upgrade will fail. You can also lose applications, files and settings from your original version of Windows software. In extreme cases, you may have to formatting of the hard drive again.