To be frank, I'd be relatively comfortable with FWs on each of the systems if you are already distributing the signal. I'd definitely back up the fw with some extras such as running adaware whic I mentioned, and also WebWasher to cut down on ads and also less than nice cookies and javascript sites.
The thing is that if each box is hard to get into, most hackers will simply wander off and go to some poor joe/jane that thas no protection.
You mentioned important files. I assume you backup. If not, get a cd backup system and start saving those files every three months or so.
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About Norton's stuff, now no one wants to hear this, as his image makers are first rate, but Symantec sucks and Peter is a thief.
There is some history going back to college days about petey stealing IP, copying. In general I find his software to be derivative and obfuscated. Symantec/Norton never does anything new, and they make things seem complex even if they are simple, to keep you befuddled.
You know, like 'Disk Cleanup' which is not anything more than
Sweep Del *.bak *.tmp
deltree \temp
and ask to clean out the trash bin.
Duh. Do it in autoexec or on startup.
Same old Stuff back to Norton Utilities I when he was selling DOS commands, like BEEP (Echo ^G) and File Veriry (COPY *.* NUL
A smoke and mirrors artist, and IP cat burglar, is not someone to trust for encryption or anti-v.
Hell, if it was not for certain backroom deals and market control, we'd still have free fax support like we did in the 1985 to 1995 era. Now one has to pay Symantec $90.
Go to F-Secure for professional a-v and infosec, people who actually work at it, and do a good job, not just float behind the curve republishing and advertising.
The tag line is, 'With the other Norton Anthologies, they pay the authors.' Petey just stole.