Windows 10 Preview is available at Microsoft.com as a free download. http://windows.microsoft.com/en-us/windows/preview
It's easy to sign up, become an "Insider", and keep up on all of the later versions released prior to the final Windows 10. It has the Windows Start button and menu that you're used to from the past, and also combines it with a little apps menu like Windows 8 has. It's a nice blend. Games such as Call of Duty Ghosts perform just as well on Windows 10 Preview as they do on Windows 8.1. Windows 10, by default, sets up desktop computers with NVidia driver 340.52 if you have a GeForce card, but you'll be able to install driver 344.11 on top of that pretty easy, and dxdiag will report that the driver is WHQL on Windows 10.
It's easy to sign up, become an "Insider", and keep up on all of the later versions released prior to the final Windows 10. It has the Windows Start button and menu that you're used to from the past, and also combines it with a little apps menu like Windows 8 has. It's a nice blend. Games such as Call of Duty Ghosts perform just as well on Windows 10 Preview as they do on Windows 8.1. Windows 10, by default, sets up desktop computers with NVidia driver 340.52 if you have a GeForce card, but you'll be able to install driver 344.11 on top of that pretty easy, and dxdiag will report that the driver is WHQL on Windows 10.