Hello, I encounter a problem and need help. My system infected with some trojans and I tried to remove them with nod32, but it didn't!! next I use eset sysinspector and located two dll files and a egistry key: opnnn.dll and jkkjabca.dll (they seem to be from Win32/Adware.Virtumonde.NBH ). They could not be deleted within windows because they were used by processes. Then I entered ubuntu and delete these two DLLs and after returring to windows I delete the registry key. I worked with it some minutes to see if there is any error message and signs of virus and other things and actually there was no problem with system. After I restart my computer I noticed that all user accounts and built-in administrator now require passwords!!! I am still challenging with it and can not enter any user account. Is this problem because of deleting these two files? Any idea?