iexplor.dll is a mass-mailing worm W32.Netsky.AL@mm. iexplor.dll tries to terminate antiviral programs installed on a user computer. Related files: %System%\lsasrv.exe %System%\iexplor.dll %System%\shlapiw.dll %System%\hserv.sys Adds the value: "lsass" = "%System%\lsasrv.exe" "shell" = "explorer.exe %System%\lsasrv.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove iexplor.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.