Spore crashes when I load specific save files.

Two of my save files now crash the game as soon as the file loads.  At the first one I thought bad luck the file must be corrupted, but now it has happened a second time, this time on my favorite and most important save.  I'm super depressed about this and I fear if I try to make a new file and work back to the original the same thing will just happen again.  What's the point if your save file will just be lost?  I've tried deleting my graphics cache, I tried transferring the files to a separate computer, nothing works. I'm really pissed.  How do I fix this? At the very least to prevent it from happening again?