‘Secure’ is a relative term. If the XP system is not connected to the internet, there is little risk. A decent virus detector is sufficient protection. I have two XP development systems hooked to a LAN, a LAN that does not have internet access. No problem.
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Apparently not true. My XP machine has never been connected to the internets.
Yet the kind folks at Computer Support occasionally ring me to inform me that they are getting suspicious messages from my Windows Computer, and can they assist me to correct the problem