Shoutbox

For a few weeks now i've had this problem and now i've finally decided to post about it because its bugging me -.-

For some reason when i go to select a directory like in the picture below, the screen shows up blank. This happens with every application i use, and now this problem is disallowing me from being able to install certain things on my computer.



Any help or advice of how to fix this problem would be greately appreciated.

Ty in advance.