I have the solution.
I have opened the folder:
C:\Users\nbh\AppData\Local\VirtualStore\Program Files (x86)\MT4 - ActivTrades - Demo\profiles
an delete the files with the date from today. It was also one file with the chart I have put the mtf-indicator.
An now the metatrader.exe is running again!

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Hello,
I have programmed an mtf-indicator and put it on a chart with a very long history. Now the metatrader wasn't running and working anymore.
I cancel the metatrader with strg+alt+delete and startet my notebook again. But now the metatrader account doesn't open again.
Can anybody help me?!