From: "Travis M." <(E-Mail Removed)>
| Assuming you own all the computers or are in control of them. Given
| that you don't have anti-virus on one of them you probably don't have it
| on the other three. So yes all the computers will probably get
| infected.
|
The problem with this question (besides in not being a virus NG) is that he didn't ask what
kind of virus. So the answer has to be Yes.
There are many kinds of viruses such as; Boot Sector, file infectors and Internet worms.
Each has a different infection vector. Only Internet worms from the Internet would be
blocked from crossing the WAN/LAN barrier but a virus can be installed via Social
Engineering, email, browser vulnerabilities, etc, etc.
--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm