[Question]Photoshop

hi everyone, ive got a little problem, well i was playing around trying to make something in photoshop again then i grabbed the fill tool (with colour red) then pressed it over the backdrop of the canvas and it changed to red... now i tryed doing that with black but it nenver went back, i want to know how i can get it back to its default colour.

picture to show u guys:

http://img228.imageshack.us/img228/4115/question7ev.jpg

reinstall pS. lol.

but that takes a whole 2 minutes >.<

take the configs to default and reload it 8/

Try using the history tool.