Ah-ha, there's an extra paragraph here. Hope I'll finally install it normally with the Vistalizator... That's the heart of the problem, I guess.
Windows Home Basic, but guys, all your advices do nothing, damn that. Even when I install Vistalizator and set the display language as japanese, text through RTP installation is just a bunch of random letters and marks (screened it below). :c
OMG, went to Uboachan to search for the same problems... There're so many of them, and at least all are different. I'm starting to think that I'm lucky enough just to open it and play once...