Update: after a few hours stress (windows was complete ###### off) i have use a systemrecovery from a week old. Steam and the steamversion of Flight removed.
Installed GFWLIVE, Flight (as stand alone version), the Flighttoolkit and have used the addonmanager for adding all the options.
After that i installed Framework 4.6 and Flightmonitor.
I'm on the point now to install al clean version of FSX (with one?) and use the tool to merge the data with Flight.
Hope someone can give me a hint how i can get a clean version of FSX,
Thank you in advance,
Flightjunk1