Right, I will try, I hope I will succeed
EDIT:

They seem to be enabled. The odd thing is that if I try to open the game, it didn't spouted any error messages.
The game acted as if it is running fine, if try to open the game the second time it says that there is already another instance running. It simply showed up on the process list of the Task Manager. It didn't crash or anything.
Should I try to download and install DirectX 9? My internet is a bit on the slow side, so it will take me quite a time.
I obviously have used the Japanese locale, since it is needed to install the game in the first place.
I will try to run the game in windowed mode using custom.exe
EDIT 2!!:
Woo! Followed you recommendation of running it in window mode and it works!!! I'm a step closer to identifying and solving the problem
But when I switched to full screen mode the pointer flashes and the game visually disappears(Exactly just like before). It seems to be actually running in the background but can't be seen at all. Perhaps Windows 8's metro interface is messing with it?
EDIT 3:
Tried to install Embodiment of Scarlet Devil. Before running I set it to window mode through custom.exe
The game ran fine, then I from inside the game I tried to switch the settings to full screen, it spouted this error message. I can't speak moon runes, can somebody translate this?
