The Operating System is locked and Windows was not included as advertised. There is already a system administrator set up for the PC and there is nothing you can do to add or remove other accounts. There is a warning that the OS is "inactive" on the desktop and it appears the only way to activate it is to buy another copy of it. I had to wipe the hard drive and buy another copy of Microsoft to fix this. Tech Support was of no help. The internals were cheap knock offs. It will not run games like Rust out of the box and other FPS (COD) the graphics have to be turned down to the lowest setting. The rig looks nice aesthetically, but runs like a turd. The only game that it will run with an OK frame rate is League of Legends. This PC is giant waste of money and I implore you to buy one elsewhere.