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well 6667 is one of the universal ports used for irc so M$ should not have used it and i think its a trojan or probably a "feature" of the M$ iexplore.exe!
DUMP WINDOWS AND USE *NIX or BSD's!
****...

iptables is pretty good or else u wanna code a custome one!
probably suse comes with it!(mean iptables)

comeon batch files are for lamers and u can delete the windir while ur in windows!and i suppose u dont use dos that much! if it is not nt try deleting win.com and replacing it with restart.com after...