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It depends a lot on your behavior.
You're on an isolated network which means a virus has to get inside your firewall. Being wireless or on a network cable makes no difference.
Usually this will happen by opening a malicious email and executing the contents, or going to a website that attempts to install malware which may require administration privileges.
If you don't surf as a power user, use anti virus and spyware software, have a firewall and generally frequent the same (and safe) sites...you're chances are actually pretty low.
-spence
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