virus/trojan horse found how do I get rid of it?

From: CTB (pnltyshot1on1_at_charter.net)
Date: 12/19/03 

Date: Fri, 19 Dec 2003 12:27:53 -0800

I found the "downloader.dyfica.h" trojan horse in the
internet optimizer file. How or what do I use to get rid
of it? Thanks!

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