ClamWin is open source which means free! It is only gonna get bigger!
Right now the big downfall is that it doesn't support real time file protection which means you have to manually scan to detect virus's but that should be fixed in the next release hopefully. Other than that imo it is all you need. There is no need to spend $ on anti-virus software unless your data is critical. ClamWin will do just fine!
Same with firewalls. XP SP2 is more than enough.
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