need help with Win32:BHO-KD

Hi, I have problem with: Win32:BHO-KD

Avast show this: c:\windows\system32\dsdmopr.dll[UPX]
Win32:BHO-KD [trj]

Avast can’t remove it, and I read something about it on forum, but I think that is every case different.
I don’t know what to do, could anybody help me!