A Primer on Fighting Spyware, by Walter S. Mossberg (from the WSJ, reprinted by Webroot Software, whose product, Spy Sweeper, is recommended in this article.) I run SpyBot Search and Destroy daily on my home PC, and tested Spy Sweeper which indicated that my risk was “low.” Remain diligent about using one, or more, of the recommended applications, as often as you can.