What Opereating System is installed in your machine? Windows XP/Vista/7/8, Mac OS, Linux, Ubuntu?

LINUX FOR EVER EL MEJOR SISTEMA

I currently use Microsoft Windows 7.

I am currently using Microsoft windows 7.

I am currently using windwows 7 and linux

I am currently using Windows 7 Home Premium 64Bit.

Window 7 Ultimate 64-bit!

Windows-7 is installed in my system

Dual boot win 7 & win 8 Opereating System is installed in My system

WINDOS 7 install in my pc

Windows 7 is installed on my PC

Windows -xp and Windows -7 both installed in my system........

Windows Vista is the one I'm using now, but thinking about upgrading to Windows 7

Windows-7 is installed in my system

It depends on your machine....
If our RAM & Processor are high end so i prefer windows 7
or if you want business purpose use Linux is best for you,
or you want to fulfill your technology purpose use windows 8 and feel the power of touch...

@Warren Contreras: No doubt, linux is very secure Operating System.

The machine I allow anywhere near the Internet runs PCLOS Linux. Putting Windows online is asking for disaster, even if you think you are protected by anti-virus and spyware guards.

I have Vista 64 bit installed.

windows xp is installed in my system