Paste this into any address bar (e.g My Documents):
Code:
Control Panel\Clock and Region\Region
It'll open this window, just click "Administrative" and "Change system locale"
View attachment 2294030
then set it to Japanese:
View attachment 2294029
I've had my system set up like this for years, never posed a problem and I never get fucky issues with Japanese games nor English games.
Note that this will also fix the issue you're having with Marina Cuckold Report 3, I saw you post an error there too lol