Spyware Warrior has a list of fake/rogue/suspect anti-spyware programs that must be avoided when troubleshooting your systems.
Why must you avoid them? Because they install spyware themselves, or they do not provide proven, reliable anti-spyware protection.
Some of them are even rip-offs of legitimate anti-spyware products such as Ad-aware and Spybot Search and Destroy. You can view these rip-offs at Anti-Spyware Family Resemblances.