slenderbro, welcome to the community.
To help us to help you, could you tell us a bit more about your computer and the install setup you have. You're clearly running Windows, but may we inquire as to the version? Also, what version of 0AD are you running?
You appear to have a similar (if not the same) problem to that reported here: http://trac.wildfiregames.com/ticket/3267. There, the reporter appears to have at some point transferred his entire "Users" folder to a different hard-drive (but somehow managed to keep the C:\ prefix). Is this also true in your case? Or any other possible oddities in your filesystem?