Mssrv.exe is a Trojan PWSteal.Drorar. Mssrv.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %Program Files%\Common Files\system\ado\mssrv.exe %Program Files%\Common Files\system\svchost.exe %Windir%\WindowsUpdate.dat %Windir%\sclureg32a.dll %Windir%\winsock_32a.dll Adds the value: "PathName" = "%Windir%\winsock_32a.dll" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill mssrv.exe process and remove mssrv.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.