Hai provato ad eliminare il file scrsver.exe e le chiavi nei registri partendo dalla modalità provvisoria? Questo è almeno ciò che consiglia di fare lo Staff di Bitdefender.
Manual Removal:
Delete the registry entry/entries described in the "Symptomps" section above; also open the "win.ini" file in the Windows folder with a text editor (eg: Notepad) and delete the lines referring to the "scrsvr.exe" or "tmp.ini" files; restart the computer in Safe Mode if possible and delete the "scrsvr.exe" file (and the original copy of the virus, referred by the "ScrSvrOld" registry entry).
Marco(amvinfe)