I just started having this problem last night after I logged out. Everything was running smoothly beforehand. Earlier today I wanted to edit a map so I tried to open the program and I got the Ogre file problem message. I closed it out, saved my maps, and then re-installed the game but now it brings up that options screen and won't go passed it. I tried re-installing a few more times but nothing's changed... (Tried restarting once too) Any suggestions?
I can get this far:

Then after I click "OK" I get this:

It's never given me trouble like this before... Well, nothing that re-installing or restarting my computer couldn't fix anyway...