Could you please be more specific. Ofcourse you allways follow these steps
but with some more information we might be able to solve your problem. THe HiJackThis forum is very busy and eventhough volonteers are doing their best there is allways a waiting time
What is indicating that you have a Trojan Horse? Do you get popups where a software company is offering to resolve your problem by purchasing their product?
Do you have a sluggy computer?
Any error messages?
Oh and BTW