Can't Remove Win32trojanagent

I have scanned my computer using bitdefender but it didnt find any virus or malware in my system, but then I have tried using some other free softeware such as Ad-ware and it have detect some maleware called win32trojanagent.

Somehow, it removed at first, but i rescanned it again and there it was again, it seem that no matter what I do it still come back. This gave me some frustration. Thats why I'm writing this to help me solve this situetion.

I tried other's people idea using google to answer my quetion but without any luck.

SO I need help to remove this nasty malware.....