steelseries.. I read this second time now.. there was a user in beta with a issue with headset from this company 
Important is to check that these audio tools are not auto-installed, which is normaly the case ( and yes, we had same cases for MSI boards, similar software ).
There are also other,older reasons, one example topic:
But disabling windows audio service is just like a big pointer to the issue .. but sometime strange things happen 
Funny part (not so funny after an reinstall…) is that it booted the first times perfectly fine, only after content manage the issue occurs…
It’s in my opinion audio related…
So disabling the dac and loading via realtek is the next try…
Have the correct language pack installed also the latest drivers no nahimic service and a pretty clean system appreciated the feedback !
Going also to test offline
these audio issues was sometime like this. Some users cant not longer start the app, for others the game crashed random. Hope test with realtek will help, then we have a starting point. May be it also kind of “what is default sound device” issue, I remember some topics about.
No difference in onboard audio or the steelseries dac (also disconnected from the system)
Strange thing is with my upgrade system i could fly for hours in MSFS rock stable only the boot part…
almost an conflict in starting sequence going to test also with -fastlaunch
guess what, reinstall (with the official directory in place) and after installing it runs fine… Now going to boot and my guess is the error is back… running nvidia driver 511.23
Second restart no problem… PC boot and test again
Running with virus software enabled (normally i disable it plus exclusion ok 3e start)
3 start running also 
Reboot and the issue is back
Finally solved was audio related and NVIDIA…
I normally install the NVIDIA drivers without HD audio driver… However Windows 11 installs the default hd definition driver if you don’t install the NVIDA HD audio driver 
That driver gives the UCRTBase.dll error, after installing the 511.79 driver including NVIDIA HD audio drivers solved the issue for me 