How Many Types Of Operating System?

There are many types. Some of them are
- Distributed Operating Systems (Network Operating systems)
- Desktop Operating Systems
- Real Time Operating Systems

Windows  7,  Windows Vista , Windows XP

Here are some basic ones: Graphical User interface, Multi-threading, Multi-tasking, Multi-Processing, and Multi-User.

Windows xp & macintosh

There r many types of os in the world, the most common 2 is mac(tiger,leopard) and pc(windows xp, vista, 7).

Depends on how you want to categorize things. I put them into the Proprietary or Open Source category, but some folks put them into the Windows or Unix category. There are Operating systems that don't fit either of the win/*nix categories though, but they are the most popular ones.

Windows (single user) and linux (multi- users)

There are many operating systems from Windows, including Windows 95, Windows 98, Windows 2000, Windows ME, Windows X P, and Windows Vista

There are two types of Os: 1.single user operating system 2.double user operating system

There are many diffrent OS's.
They divide to:
- unix based (MacOS, Linux (all distributions))
- dos based ( MSDOS, MS Windows)
- other like portable versions of above OS, Sun Solaris and other that I do not know about.