SpyBot is great but it does not protect you from Virus attacks.
i have used it for many years and love the teatimer part as it will not allow anything to change the registry without you knowing. Again though it does nothing for virus protection.
I use AVAST on this one never had a issue. I use McAfee on the other 3 computers in the house because it is free when you have Comcast. I would use it on this one too but sadly it does not support 64bit systems.
I used Norton for years and it is ok but it clogs up your system and when or if you decide to change it is a son of a booger to get totally off your system.
For some help with virus and spyware check here
[Only registered and activated users can see links. Either login above or
Register Now]
It is a great forum for computer help