where are the 7 keys?

I can only find 5 of them and it is getting very frustrating as have sailed through the rest of the game any ideas?

You just have to look in all the rooms you have played. When you find them you will then go to the cellar and the game continues from there. Finding the keys is different depending on the mode you played at the beginning of the game. I've had this game for years and really never paid attention to where I found the keys! They are all there.