If you want to know if your computer is ready for the new Microsoft Windows 7, there is a tool called Microsoft Windows 7 Upgrade Advisor Beta, released from Microsoft that help you to perform a check on your computer and give you the answer.
As described in the Microsoft Windows 7 Upgrade Advisor Beta , Brief Description :
Windows 7 Upgrade Advisor scans your PC's system, programs and devices to check if it's able to run Windows 7. After a few minutes, the report will let you know if your PC meets the system requirements, if there are any known compatibility issues with your programs and devices, and will also provide guidance on your upgrade options to Windows 7.
Please note that is required the NET 2.0 Framework.