Chrisll wrote...
sry but i dont really get it could you tell me step by step please? what do you mean with av and when I want to reinstall it it des not let me pick another folder
AV = Anti-virus. On your anti-virus definitions you should have a option to temporarily disable it.
To use compatibility mode right-click the game executable and go to properties / settings or similar (my OS isn't in english), go to the compatibilities tab and select windows xp sp2 for example. A little below you should see something like privilege level. Tick the selection box to run the executable as admin.
Try to uninstall the game using the game engine (mount the game and when you see the menu with the option to install the game search for the one that uninstall it (the menu is in japanese so try clicking each option to know which is right).
Then try installing it again and select another folder. I find it a little strange for the game to not allow installation on other folder but since since we're talking about the rUGP engine, I wouldn't put it past it.