Microsoft has developed a tool that scans your computer, and it will let you know if your computer is ready for Windows 7. if not you will get a report the tool is call Windows 7 Upgrade Advisor
If your PC can run Windows Vista, it can probably run Windows 7, but
some thing as the graphic device is not Windows 7 compatible you can
still install Windows 7, no worries the desktop will be loaded with
basic configurations without Desktop Windows Manager ( DWM ) which gives
the transparency and 3-D look to windows 7.
Download the tool:
http://windows.microsoft.com/en-us/windows/downloads/upgrade-advisor
http://windows.microsoft.com/en-us/windows/downloads/upgrade-advisor
