Step 1: Back up files or data you want to keep
Use the backup utilities that are built into Windows XP, Windows Vista, and Windows 7 to transfer files from your old computer to your new one.
If you’re getting rid of a computer that is running Windows 8, use File History.
Step 2: Remove personal information from your computer or device
If you use a Microsoft Certified Refurbisher, they will help you remove your data and help you donate your equipment to people in need around the world.