Antispyware Software

mutiple security programs

Is it ok to have 3 different security programs. To make sure as much spyware, viruses, and worms be identafied as possible?

Do you think Windows Defender is at least as good as Microsoft AntiSpyware ?

When Microsoft AntiSpyware was first released, I installed and used it for several months, and I was really satisfied with it, but I have the impression that after migrating to Windows Defender, the level of anti-spyware protection has lowered to the point that I felt the need to install another...