Posted 11 October 2005 - 01:11 PM
It is NOT true, if you have both active at the same time, which can lead to conflicts within the operating system. Having both on your hard drive, even with only one active at a time, also leads to one AV reporting as viruses things found in the other's vault which can be most confusing.
This should not be confused with having several anti-spyware applications handy, and running these one at a time; THIS kind of layered protection is necessary because the various companies will have different criteria for what constitues spyware, and will consequently look for different things.
I hope this answers your question,
Whereof one cannot speak, thereof one should be silent.