Ron,
 
Check out the free rescue disk from Sunbelt Software, live.sunbeltsoftware.com.
The VIPRE Rescue Program is a command-line utility that will scan and clean an infected computer that is so infected that programs cannot be easily run.
 
Someone can download a copy every month or so and scan all the systems.
 
I keep a current copy of the VIPRE Rescue Program on all my systems and several USB sticks. This way I can press F8 at Windows boot time and get into DOS mode. Then I can scan a system for critters. I have had to do this several times on the family PC for stuff that Norton missed.
 
If you did buy an AV program, since TSS is network but not Internet connected, then someone would have to do like they do for disconnected Government computers - someone would have to download the virus definition  and program updates then manually move the updates over.
 
Sunbelt does offer a Home site license for those with 3 or more PCs - $50 for 1 year to $125 for 3 years.

Nigel
 
> I have a question for any of you who are knowledgeable about
> computer antivirus/anti-malware software. The question is "cave
> related" in that it deals with the special needs of our TSS
> computers, which are somewhat different from those of most home and
> business computers, because the TSS computers are not connected to
> the Internet.
....
>
> Thanks,
> Rod Goke
> (512) 892-4186
>
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