My E Drive?

<<-- click to expand

Yeah, I've been trying to load the old Zoo Tycoon. It told me that I had no room when I loaded the first version, but when trying to add the Expansion Pack it's not letting me.
I took a screen shot, because I figured that'd be more helpful then trying to explain it.

I'm not overly computer savvy, so bare with me here haha.

Thank you in advanced to everyone who tries to help.