Check for hardware compatibility before installing(for Windows 7)

          You should know before shifting to Windows 7 whether or not your peripherals like printers and scanners, which you have been using till now, are fully compatible with the new operating system.

          Visit ‘www.microsoft.com’. Navigate to ‘Windows’ and select ‘Windows Compatibility Center’. Select the option ‘Hardware’ which is given on the left side and enter the name of your device in the search field, for example ‘Epson Perfection’ for your scanner. Then, click ‘Search’. Your printer should work fi ne if you are able to view the ‘Compatible – Windows 7 Logo’. Now it can be said that the model has passed the Microsoft tests. The entry ‘Compatible’ means that the manufacturer has checked the function. In case it displays ‘Not compatible’ message it is recommended that you stop the upgrading to Windows 7 if possible or purchase a new hardware
Note: The list is too long but still incomplete. The new Windows is compatible even for the devices which are not mentioned in the list.
source: chip plus