Did you try sending them to avast for checking?
As people said above, there is no 100% protection
Also avast provides email, phone, and forum support to free aswell as paying customers, nortan is somewhat unfriendly to the paying customer anless you are a big company.
Another thing, when Nortan fails to detect 1 - 2 virus(es), are you going to change you anti-virus again and waste more money?
--lee