* 1 GB of RAM for a 32-bit Windows 7 and 2 GB for 64-bit Windows 7

* 16 GB free space for 32-bit Windows 7 (20 GB for 64-bit)

* and a graphics card/chip powerful enough to run the Windows Aero graphical user interface.

Microsoft says users should plug in all of the external devices that they want to check for Windows 7 compatibility.

Unlike the , the Windows 7 Advisor does not recommend a specific version of Windows 7 to users based on the results of the scan. Windows 7 comes in six versions in the U.S., though two main ones: Home Premium for consumers and Professional for companies.