Are you thinking of purchasing a new computer? or simply just going to sell/give away an old machine? You may want to read this!
Most of us know before ever disposing of a computer, whether we are selling it, or simply getting rid of it for a new one we must format the hard drive to ensure nobody can get to our private data, banking details, pictures, emails etc. I am certain there is at least one piece of information on your computer that you do not want anyone to see, you may have deleted it in the past, but it can certainly still be lurking around in cache or temporary directories on your computer.

How to Securely Erase your Hard Drive @ revHardware