Endnote X3 keep deleting all my references and closing down!!

Hello all - i am really hopeing someone has an idea on this as its driving me up the wall!! 

Every time i save and close endnote (x3) down it deletes half my references, and of the remaining deletes all the label info. I thought it was a one off so spent hours re-entering all the info (i keep hard copies) and re-labeling them, only to have the same thing happen again! It also shuts down periodically, deleting all the work!  

The university is’nt being too much help so any ideas??