command at that run from cmd isnot working

Question

I run the following AT command in windows CMD: at 8:52 "start calc" it is scheduled and can be seen in the list when running "at" but when reached the time it is not executed as accepted and when running "at" again it is deleted from the list ??? What is the reason and how to fix it ?

See the screen capture of the CMD windows commands.

Answer 1

Thanks for all the suggestions I used schtasks.exe that works on win 8 and 7:

schtasks /create /sc once /tn run_calc /st 17:07 /tr calc.exe