If you want to comment your particular problem post it on the “whats your computer problem” page, and ill get back to you STRAIGHT away.
Computers are really nothing more than a very powerful calculator with some great accessories. There not very intelligent devices.
So how do you tell a computer what to do?
Well a keyboard and a mouse are the standered way of interacting with a computer. Joysticks and game pads are used mostly for games.

How do i know the computer is doing something?

The monitor which is the screen shows you exactly what the computer is doing.
What is a modem?
A modem allows you to communicate with other computers using a phone line. Also a modem, E.G. virgin modem, allows you to connect to the internet.
What is Computer RAM and what does it do?

RAM – Random Access Memory, or volatile memory, is used by the system to store data for processing by a computer’s central processing unit (CPU), also known as the processor.
How does a computer saves data and programs?

