Cant print or save a document as both these are greyed out on the drop box .

So I opened an old excel document and edited it then and tried to "Save as " but that was greyed out on the drop down menu .Ok I will just print it I though but "print " was also greyed out. So tried to close the document and it asked me if I wanted to save my changes, which I did but I cant .First time its done this .Any ideas on how I could fix it.