Trojan Horse Removal

Hi there,

Please could somebody assist with the removal of a trojan horse that I seemed to have acquired in February 2008. It’s called “Trojan Horse Downloader.delf.12.AN’
and I’m running windows xp.

I’ve downloaded hijackthis & combofix but I’m not sure on the procedure.
I’d be most grateful if somebody wouldnt mind helping me out.

Cheers.
Freakdog