Age of empires save game problem

I had the same problem several times with AoE Rise of Rome , when I try to load a saved game it crashes to windows with an error .. first I tried to solve it by saving the game more times in a row , like three or four times , but once all four of my saves were corrupted or whatever so I tried to save the game while not having any building or unit selected . So far it works fine , but some saves where I had sth selected worked also . DON'T KNOW if this is a TRUSTY solution , but as I said I had no errors so far.

I do have enough free space on my pc, but when i try to save the game age of empires it says not enough free space