I run SpyBot Search & Destroy 1.3 along with Avast. SpyBot protects against, and removes, spyware…which is not a function that Avast performs. They’re separate issues. Eddy recommends using AdAware in conjunction with SpyBot, which many persons do, as one sometimes catches spyware that the other does not, and both are available for free. The combinatoin of SpyBot and AdAware is the only one I am sure, however, works well when running together. Some anti-spyware programs interfere with each other when run concurrently. Both SpyBot and AdAware free versions can be obtained from www.tucows.com.