ok now there is a test post..i want to keep it short but also meaningful.
Linux is not Windows. There is a super user, (root) , who can do everything, has the overall control of the machine and other users. When you install linux for the first time, you will be using it as a normal user and as a normal user you are not allowed to do "everything" on your "own computer". If you want to play around with your box and explore new stuff, just open the terminal window,type...