I m willing to upgrade from Vista to Windows 7. Could you plz help me to know about the best features in Windows 7?
Best feature? It doesn't have Metro UI Basically Windows 7 is Windows Vista done right. Feature wise I wouldn't say it offers anything over Vista that would be worthwhile to you, except for better speed and reliability. I believe you can go from Vista to Windows 8 if you wait a couple of months. If you are going to pay to upgrade your OS, Windows 7 really isn't 'worth it' now since it will cost you a lot more than the upgrade to Windows 8. Windows 8 performs even better than Windows 7, and should be fine on your existing hardware.
I have installed W7 on quite a few systems over a couple of years and the callback for general system problems is low whereas Vista was a PITB,so on that stat alone W7 wins just backup the fresh install and generally you will rarely use it, oh and it has `Fax and scan` lol