The file CAD.EXE is malware related.
You must delete the file CAD.EXE immediately!
Delete the file CAD.EXE without delay!
Kill the process CAD.EXE and remove CAD.EXE from the Windows startup.

CAD.EXE Information and Removal:
MD5 of CAD.EXE = 2C1A44951ED39C39050839E4F325A02C
CAD.EXE size is 112192 bytes.
Full path on a computer: %SYSTEM%\CAD.EXE
Related Files:
%SYSTEM%\CAD.EXE
%SYSTEM%\CDLL.DLL
%SYSTEM%\FT_ND_API.DLL
%SYSTEM%\LANGUAGE_GB32.INI
%SYSTEM%\NETMANSERVICE.EXE
%SYSTEM%\OFFICESERVER.INI
%SYSTEM%\SDATA.DLL
%SYSTEM%\SDATA2.DLL
%SYSTEM%\SERVER.EXE
%SYSTEM%\SYSTEM.INI
%SYSTEM%\UPDATEOFFICE.EXE
%SYSTEM%\VIDEOS.DLL
%SYSTEM%\VNCHOOKS.DLL