glatzfront

Thanks for your reply and trying to help. I found that if I change the "User's account" to System when running the task i don't get the Dos window. Again thanks for your suggestion.

Vista Ultimate x64 I'm using the Task Manager to run a Windows Defender Quick scan which works OK except a Taskeng (command) window appears on screen until Quick scan is completed. Run Command produces the same result. Closing the window causes an error in Defender. Is there a way to suppress this window with a change to this command line ? Any help would be appreciated! "C:\Program Files\Windows Defender\MpCmdRun.exe" Scan -ScheduleJob -WinTask