viruses like the rootkit

certain viruses can be really hard on your computer.  Malware like the rootkit virus can be a nasty little bugger which can hide itself in your computer and be hard to find.  Other viruses are not as bad.  There are all kinds of viruses, some of which are designed to steal your information while others just toy with your computer.  The biggest thing is you need some sort of computer protection.

Learn about the root kit virus.