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Yes you can get too much of a good thing and you can go overboard with it.

I use DropMyRights for all programs that access the internet, that limits the potential damage that can be done, files can’t be placed in the system folders nor entries added to the registry. That goes a long way towards your overall security. I have avast, outpost pro firewall, adaware, ewido, SuperAntiSpyware as my main protection with HiJackThis if I’m in any doubt.

I haven’t used an on-line AV scanners for years, mostly because they require activeX and I try to avoid that like the plague or they uses Java and I don’t have that installed )I have never found anything that requires it that I absolutely must have), one less thing to keep up to date or present an opening for any Java vulnerability.

Add to that a degree of common sense and practising safe hex this further bumps up your security without having to swamp your system in anti-this_and_that programs.