Sandboxie is an interesting alternative to traditional anti-virus/anti-spyware software. According to the developers, when you run a program on your computer, data flows from the hard disk to the program via read operations. The data is then processed and displayed, and finally flows back from the program to the hard disk via write operations. For example, if you run the Freecell program to play a game, it starts by reading the previously recorded statistics, displaying and altering them as you play the game, and finally writing them back to disk for future reference.

Sandboxie changes the rules such that write operations do not make it back to your hard disk. The key is the transient nature of the sandbox which makes it easy to get rid of everything in it. If you were to throw away the sandbox, by deleting everything in it, the sandboxed statistics would be gone for good, as if they had never been there in the first place. You maye in fact prefer to run your Web browser inside the sandbox most of the time. This way any incoming, unsolicited software (spyware, malware and the like) that you download, will be trapped in the sandbox. Changes made to your list of Favorites or Bookmarks, hijacking of your preferred start page, new and unwanted icons on your desktop - all these, and more, are trapped in and bound to the sandbox.

This is a very original solution to the perennial problems caused by adware, spyware and malware. However, it's dubious as to whether it can deal with the continual sophistication of such programs.