When i save it it's ok but when i try and load it it says file open failed does any onee know whats goin on.
Max will do this to you sometimes. Best thing to do is to check your autobacks, go to your max install directory, find the autoback folder, and open the last autobak.max file that was saved. Hopefully you won't have lost too much. Another option is to open a new max file, and then merge in one by one your objects from the saved scene that won't open, when you get to the object that won't merge, that's your problem. Try these two first.
Did Max crash last time you had the file open?