you have the "powerIOS" or the "MDS" files from the original part download files you extracted correct? when you mount them using "DAEMON" or whatever software you are using right click on the disk in the disk drive and open the files u should see a "bunny" folder in there, try copying that folder and pasting it onto your desktop and run the game application in it, if it is working correctly in Japanese put the patch in the folder and run it, after its done patching it should be fine. *don't run the install application*
Now there may be a problem with "saving", god forbid it took me about 2 hours to figure it out but i think the problem was is that i was trying to install it in "program files" so just for kicks i decided to take the bunny folder out of it and put it on my desktop and true enough it stopped getting errors when i tried to save