TimeSnapper is a cool Windows application. It’s..
…an Automatic Screenshot Journal. It runs in the background of your computer, taking screenshots of your desktop every few seconds all week long… you can play back your week just like a movie. You can play it at any speed you like, and jump in at any time you like.
I used it for a week and it works well, although it can use up a lot of disk space; it will take a screenshot of your desktop at whatever interval you have set. I had mine set at every 2 minutes. Each screenshot is saved as an image (eg. jpg), which can be easily browsed with their intuitive interface.
Don’t use this if you’re not aware of how much time you REALLY spend on the internet.