iueninet.dll is a Trojan.PPdoor-Q. iueninet.dll opens a back door. iueninet.dll tries to terminate antiviral programs installed on a user computer. Related files: %System%\dpnetmsg.exe %System%\iueninet.dll %System%\fsmgntfs.dll %System%\ntmapast.dll %System%\ir50psrv.exe %System%\kbd1uery.dll %System%\lfyockaa.dll %System%\a15svcs.exe %System%\dpnmdlib.exe %System%\c_28usic.dll %System%\atiysnpn.dll %System%\treemqoa.dll %System%\arptutdn.dll %System%\eulapart.dll %System%\smlo8thk.exe %System%\odbcfwci.ime %System%\hgakheg.dll %System%\jkwbhew.dll %System%\testtest.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove iueninet.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.