problems with .vbs script and task scheduler - manual execute works, task scheduler does not

I have a script saving pictures as .jpg. The script openes invisible using a .vbs script, sets focus to the specific window using another .vbs script.

If I double click the .vbs startscript everything works fine and perfectely as it should.

Unfortunately, if I start the .vbs startscript via task scheduler it does not work. It does not set focus onto the window, it does not save pictures.

I do not understand why. What is the difference? The script is executed with the same user and with highest privileges.

Is there a way to assign a display manager to task scheduler? Which display manager is assigned to the script, because simply double clicking the script works.

(windows 7 Pro)

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