What Operating System do you use?

Using windows 7 64bit at the moment, might upgrade to windows10 soon

osx here

i use windows 7 because its best as security
but windows 8.1.1 is best for gui

I use Windows 10 64-bit. It works well enough for me.

Loyal linux user. I'm currently using Fedora 25, but I used to use Arch linux until I had problems with drivers :(

Windows 10 Pro on my gaming rig, Windows 10 Insider on the HTPC and Win 7 on the lappy.

Windows 7 64bit Ultimate
I refuse to upgrade to Windows 10, as it sucks

Depending on the goal, Linux and Windows various distros/versions.

Win7 Ultimate :thefinger:

windows 10
would like to get windows xp but cant seem to find it any where