2.Find your serial number and purchasing information. You may need this information during the free upgrade process.
3.Contact the people you bought the computer from. If you bought the computer at a store, they may instruct you to contact the maker of the computer, if they do not carry free installation kits.
4.Contact the computer maker. Acer, Dell, Sony and other computers have their own free upgrade links. Talk to a customer service representative to find the link for your computer.
Keep in mind that since Windows has released Windows 8, the free Windows 7 upgrade option may have expired.
Type in your serial number and other computer information.
6.Download the file to upgrade. In some cases, you may receive a disk in the mail.