What Makes All-in-one Security Systems Effective?

Well, they won't conflict with each other is a biggie. I think it's more effective to use individual security software that are solely designed for a specific task. The AV in a security suit might be excellent, but the firewall or spy-ware might not be.  I personally use, A v i r a free and Outpost 2009 free  in real time. Once a week I use Super Anti Spy Ware, Panda Anti Root Kit, A Squared--as a scanner, C cleaner. These are all excellent software and are free.