Given the degree to which the press love to seize on such stories you are probably aware that there are quite a few nasty pieces of work out there that would like nothing better than to seize control of your computer for their own nefarious purposes.
In reality the truth is that although there are some antisocial people out there it really isn't all that difficult to obtain a basic level of security.
A major part of the security is common sense and an awareness of the issues involved. Hopefully this section can help in the latter department.