As you suggested, old virus software would not be updateable because of the the latest virus definition files being incompatible.
In order to have better online security you really should consider upgrading to a new or used computer which runs a more up-to-date version of Windows, or certainly nothing older than Windows XP which most security software developers are still supporting.
Thanks Phil, but I'm into legacy computing. Alot of people seem to be confused by that...it's really no different than someone who has a classic car that they like to drive once in awhile, just for a "blast from the past".
What I may have to do though is keep my browsing very generic...no logging into email or any other sites with personal info. That way if I get a virus, at least I haven't compromised any personal info.
In my original post, I stated that I have Clamwin, but I'm not satisfied with it (no real-time protection, quarantined items folder too hard to find, etc). But it looks like I might be stuck with it, unless someone knows of another kind?
I know this post is a little old, however, Avast 4.8 is still being updated. Support was supposed to drop in 2009/2010, but the signature definitions are still being released on a daily basis. It's a great program, runs on Windows 95 and later, and only requires a 486 with 32MB RAM.