Microsoft realeased an Upgrade Advisor for Windows 7. This utility scans your PC's hardware and software, analyzing and testing. It will determine if your machine is ready to take on Windows 7 and the steps you should take towards upgrading your Windows Operating System.
Technically, if your PC can run Windows Vista flawlessly (disregarding Vista's issues) then the chance of Windows 7 running perfectly on your machine is high.
The utility sends the information it gathers to Microsoft but it is not used to identify or contact you. At least that's what Microsoft reports. You can find more information and download the utility from Microsoft's website right here.