Hey, Have you tries Linux?
Many of the computer user even do not know what is operating systems. Some of the users know windows and feel that computer is nothing but windows. A decade back even I had same concepts. But nowadays I started working on Linux with all such applications which you can find on windows.
I tried Ubuntu and Lunix Mint. Interesting part is I have installed Ubuntu 10.04 as an application inside windows so I get dual boot option. But for Linux Mint I am using a USB Drive. So just insert USB drive and start your PC/Laptop. So even if you have authentic windows with you, still you can try Linux without affecting your windows.