by 
bigkado69
ANSWERS: 4
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Yup. Even if only one has access to the internet. They usually don't even firewall between each other.
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It depends. If your computers are networked then then the virus could spread from one computer to the next. If they are not networked but you simply use the router to connect to the internet the virus can not spread from one computer to the next via your router.
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Yes some viruses will pass through if you do not have a firewall between comps. Depends on what kind of networkin and anti virus you are using
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Yes they can. I assume by virus you refer to all types of infections: viruses, worms, trojans. There are so many vectors for infections to follow, the least being open ports, OS and software security holes, out-of-date (or non-existent)antivirus software and mediocre firewalls. Yes, even your (software) firewall may not protect you against an infection from another computer on the same network.
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