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Is the file %SysDir%\netempresa.dll located on your computer? Your computer is infected.
We highly recommend you to remove %SysDir%\netempresa.dll from your computer as soon as possible.
%SysDir%\netempresa.dll is Trojan/Backdoor.
Kill the file %SysDir%\netempresa.dll and remove %SysDir%\netempresa.dll from Windows startup.