Well,after deleting iobit malware, i tried something i found on YouTube.
Someone found out to disable the "deepguard" which , in my case works in Ziggo safe online.This did solfe the problem, So you where also right that it had something to do with a antivirus program. Sadly i ,after a lot of testing, already removed Xplane. So now i have to re-install all my dlc (a lot) and re-program my flightset. Thanks for you're responce and advice.
Best regards; Leo