No idea what's going on, but I'll try to help.
Sometimes, when running a VN in admin mode, it might not properly recognize your save data. Don't ask me why, it just sometimes happens. I'm pretty sure that if you open the game normally you will be able to load your normal save files.
As to your problem of being unable to save, can you save a screenshot and put it here? It might give us an idea of what's wrong.