Your computer stores more information than you think. All over your hard drive there is information about the sites you have visited, files opened, people you emailed. Most people know about clearing IE history and emptying their Recycling Bin. But a simple browse through a few key Windows files will soon uncover your habits. It doesn't even take much to discover these things. You can purchase a program like "Fast File Undelete" for $19 and get back files you thought were long deleted.

What types of things are stored that you don't know about? Windows has a hidden index.dat file that stores the sites you have visited, and it stays around even if you clear your history! There are many other programs that keep histories too, like Windows Media Player, Kazaa, AOL, MSN Messenger, Yahoo! Messenger, Microsoft Office, and many, many more.