33.exe is a mass-mailing worm W32.Anpes@mm. 33.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\33.exe %Windir%\vtemp.dll %Windir%\vtemp.vbs %Windir%\winsnav.vbs %Windir%\win32sp.vbs Adds the value: "winXP" = "%System"\33.exe/background" "windef" = "Win32sp.vbs -quiet" "NAV Agent" = "%Windir%\winsnav.vbs" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill 33.exe process and remove 33.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.