The problem your going to find is that most antivirus runs through a database of know loggers in this case. A home made key logger probably wouldn't be in the database. Have you considered a firewall to try to prevent this before it occurs. Also most antivirus will search for keyloggers not just spyware and adaware.
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"The most abundant element in the universe is
hydrogen, then second is stupidity."-Harlan Ellison
"What good fortune for our governments that the
people do not think."-Hitler