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Anything that hangs in the memory doing not much - if nothing. For example all AVG live components. They can be switched off so that you have scanner/remover alone. Still will be taking some memory - as resident module is an "essential" part of system. All modern security suites are trying to play "big brother" for the computer soft.
What I have to have - a good firewall. It's a must for every Internet machine - as most of threats are net-based these days. Time of old program-infecting bits of code if not passed, coming soon. Plus, some pure scanner (sort of Spybot). Spybot is getting bigger, though - tries to become Norton or something?
Did not have virus infection in years - just used common sense not to open on my working machine anything that may be infected (checked occasionally by loading, scanning, then uninstalling some antiviral monster).
Also, found free program Ccleaner quite helpful. It may take a lot of resident memory hogs off startup list - speeds up all the system considerably. Plus takes rubbish out of the system and registry. Years of use did not find any "bad habits" in this free marvel. AVG sits residentially on my kid's computer, though...
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