I installed utau and it doesn't work at all!!

I got my new computer, and changed locale etc to japanese. (it's windows 10)
and i keep getting the same error every time i try to do something with defoko !


i don't want to quit utau because of this :'( please help me asap
i also downloaded the 4.18e version too. and the previous one. but nothing helps!

 

update: i may have found the reason, why it doesn't work, but i do need some irl help for that ;;