How Safe is Your Computer?

So, according to the Washington Post here, the government hires a computer consultant. 

And the computer consultant breaks into the government computer. 

And data on the government computer is compromised.  And this includes FBI data such at the classified documents and the password of the Director of the FBI.

And the program used to do this was on the Internet. 

So, the question is - how safe is your computer if this can happen to the head of the FBI's computer?

(esp)