Posted 05 July 2006 - 12:25 PM
There is a major difference between anti-virus and anti-spyware applications. Most here will recommend only use one AV on your computer (especially for real-time protection) because of potential operational conflicts, and at the same time recommend having several anti-spyware applications.
Because the definition(s) of spyware are somewhat subjective, each company will have its product look for (and therefore find) a differing set of problems; having more than one such application will thus increase your coverage of that kind of malware.
Hope this answers your question.
Whereof one cannot speak, thereof one should be silent.