I have a number of machines running Dual Win10 and Win7 boot drives. If you have room in your case for multiple drives you can install both a Win 7 boot drive and a Win 10 boot drive in the same box and use the BIOS boot setting to select the drive the machine will boot to when you start your machine. And/or you can swap drives like Timothy is doing. On using XP ... It will install in Virtual Box on Win 7 and/or Win 10 and works fine in either environment. Also true for FreeDOS (and the FreeDOS - Fractint VM) I have also tested WinXP, Win7 and Win10 in VirtualBox on a MacPro Workstation and they all work fine. The Virtual Box Extensions allow XP to be very versatile in configuring your display settings so Fractint can use a big display context. On Never10 - I have tested it on a number of Win7 machines and it works great I am loving all the wonderful Fractal discussions and new fractals! (That said, I don't mind a bit of the off topic posts) -- -David www.lemoncreekdigital.com