Welcome. You might want to do a search of the forum before starting a new thread. There’s quite a few solutions to issues in here now.
Look through the thread listed below as there are a few fixes listed that should help. First, check to see if you have a non-ascii character in your windows user name. That’s a common problem. But some others listed here… I cannot load any different airport and plane - always the same airport and same aircraft - #76 by hobanagerik
Regards