General Computer Questions

What are the different types to install of windows xp

CD Tray keeps randomly opening with no disc inserted.

I received e-mail supposedly from my brother, but it was about buying Viagra and Cialis. How could this stranger do this, and what must I do to prevent more from coming in?

Tried to get on another computer and my friend didn’t know his password. Every time I turn on the computer his router comes up and I have to reset to my home router. How can I get rid of his location he lives hundreds of miles from me