QUOTE (Mischcabob @ May 4 2005, 12:05 PM)
Yes. 2 or 3 isn't bad when you use them as on-demand scanners, not real-time monitors.
For example, I run Ad Aware professional SE, Trojan Remover, NOD32 antivirus and ZA Pro. Mated with Firefox with popup blocker, I haven't gotten any nasties/spyware/trojans for over a year.
There are always potential conflicts/bugs running similiar programs, not to mention cluttering up your system with redundant, unnecessary programs. Running 2 firewalls or 2 AV is definately not recommended. I won't even touch ActiveX i.e. free scanners that cause potential problems/instability issues with I.E.
Hope that helps a bit.

Only 3 of the above are active scanners ...
1) Microsoft Anti-spyware
2) Spybot SD-Resident (only if you use IE)
3) Webroot Spysweeper (which is shareware - 30 day free trial)
Oh, I have experienced no conflicts thus far with all of the above installed. Each program catches different spyware ... I really cannot find a comprehensive solution

... really ... For example ... each program catches things that the others miss ... and yes they all miss something, I tested it several times, thus far I have found no program that will catch all spyware, but if and when I do I will certainly remove unneeded software that is 'redundant'.
If you have better (more comprehensive) programs, pls post links to them ... I hope they are freeware, but some shareware would be ok too