Welcome to the forum caifaguar73 !
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solve the problem that is in Windows,
Can you be more precise ? What problem exactly?
Here im just guessing. I think this is about using the correct back-end(?)have to change the virtual synthesizer.
For ALL windows users we recommend SDL
https://lmms.io/wiki/index.php?title=LM ... o_Settings
Do you mean setting uo your default sound-font:achieve real MIDI sounds, of course depending on the soundfount?
That is done in the sound-font path
https://lmms.io/wiki/index.php?title=LM ... ings#Paths
If my guesswork is of, please post the question in your own language, but be short and precise :)