Microsoft has made many operating systems like win98, win xp, win7, win8 etc.windows 7 is very good os to use.Initially I was not font of that os.But after using it I released that this os is very powerful and easy to do all type of works.This is very much user friendly os.
The very important matter of the os is you can find maximum driver inbuilt in this os, so that you need not install driver software for maximum motherboard.