One thing you can do if you want the presents to behave is this 

make different parts of the piece of work you are doing in different documents then import them into the presents  then use it for your main document then delete the old version and re import it back as a presents. It does depend on the size of the file though (I always save mine in User mode) that way you shouldn't lose all your work and other presents you have made. 

Hope This helps you I had the same problem with my last computer the file was so big it completely refused to work (I tried reinstalling and it failed to give back the presents)

 

Karl