do all computers need operating systems?

Well the answer to this glorious question is... not really. I mean you cannot really do much without an operating system so your hardware would pretty much be worthless.  The operating system manages all the applications and tools on your computer. Without it you would be staring at a blank screen. All computers use an operating system. Even video game consoles, cell phones, PDA's and some tv's have operating systems. Windows is the most widely used on desktops and laptop style computers. I guess the real question is, do you want a computer that works? then the answer is yes, it does need an operating system.