hello, i'm a french fan of the neverhood so sorry if my english is bad

I have a horrible bug, after the beggining of the game, when i am walking on this bridge, under a thing like "really really big bath" the game just block (i am not shure if "block" exist in english, i mean that the scren and the game don't move anymore^^) I can't do anything and i can't move the mouse

so help! i haven't never had this bug before...

thank you!