Never come accross anyone hacking your computer, there called viruses and spyware it is not actually a person, it is like a bug, and a virus checker is the antibiotics it keeps your computer healthy
Yeha thats right.
Getting rid of them is very hard for some viruses, it is usually the ones that dont do much damage, once i had a virus called P.E Parite and it was a pain in the ass to get rid of it, it damaged aload of my game files.