Get Ewido 3.5
This solved my problems (I hope). It detected trojans, CWS and others when AVG, Mcafee, ad-aware, hijack this!, CWS Shredder, Windows Malicious Tool Remover, Spyweeper, Mcafee Stinger and online antivirus scans could not.
I reccomend the trial version to all.
I am still looking for a removal tool for trojan downloader.DJN however. Hijackthis! logs don't show up anything in particular.