Microsoft has launched Windows 7 Upgrade Advisor Beta.
Windows 7 Upgrade Advisor scans your PC to see if it's ready for Windows 7, and tells you about any known compatibility issues.
check out yourself. click on the link below.
once you will download the program it will scan your computer and will let you know if your can upgrade to windows 7 or not. It will even tell you which version of windows 7 is for your computer and whether you will need clean install or not.