hvordan fjerner jeg trojan/virus

hvordan fjerne jeg min trojan/virus, fordi jeg kan ikke connecte til nogen IRC server uden den siger:

14:59:41 » * Connecting to tiscali.dk.quakenet.org (6667)
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14:59:42 » -tiscali.dk.quakenet.org- *** Looking up your hostname
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14:59:42 » -tiscali.dk.quakenet.org- *** Checking Ident
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14:59:42 » -tiscali.dk.quakenet.org- *** Found your hostname
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15:00:41 » -tiscali.dk.quakenet.org- *** No ident response
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You are infected with a trojan, please clean your PC.
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15:00:43 » Closing Link: Nottie by tiscali.dk.quakenet.org (G-lined)
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15:00:43 » * Disconnected
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15:00:46 » * Connect retry #1 jubiigames.dk.quakenet.org (6667)
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15:00:46 » -jubiigames.dk.quakenet.org- *** Looking up your hostname
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15:00:46 » -jubiigames.dk.quakenet.org- *** Found your hostname, cached
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15:00:46 » -jubiigames.dk.quakenet.org- *** Checking Ident

W00t can i do???

HEEELP