Strange thing: Yume 2kki ran smoothly & worked normally when I hadn't open the .exe of the RTP in the AppLocale, just downloaded it and installed that version. I could even enter one of the worlds and explore that area. But now, nearly 24 hours later, when I haven't change a thing, it crashes in the moment I go to sleep.
I'll never fully understand the mechanics of the Japanese games, 'cause there was the same problem with Yume Nikki, it often crashed for some reason. However, it started to work like it has to after I restarted the PC twice. >_<