Windows 7 Upgrade Advisor
My experiences tell me that running Windows 7 on a machine which supports Windows Vista is not a problem at all from hardware compatibility point of view. But, for those poor machines which have not had the taste of any of these platforms yet, there is a quick way to know whether your PC can support the latest Windows 7 RC.
To begin with, just download, install and run the Windows 7 Upgrade Advisor, which is just a reliable product although a beta now, it gives you a report that tells you if your PC can support and run Windows 7 and also further information about possible compatibility issues.
It is advisable to plug out any sort of Universal Serial Bus devices or others such as printers and scanners before you actually run the Windows 7 Upgrade Advisor.