You have insinuated that someone has deliberately infected your system with malware. But you haven't given us any idea of what kind of malware. It would be helpful to know what type of infection you have and how you found out about it.
It appears that scanning with spyware/adware programs and the AV program have been only partially affective. I have not examined the HijackThis log, but I would like some information on this malware.