Photoshop 7! All white! Need help!

I need help! (Photoshop-wise. Obviously).

My computer was acting strange and slow the other day (it does this a lot - I may have to destroy it), and when I tried to use the paint bucket tool in PS7 to fill my image, the [insert applicable swearword here] filled the space around the canvas instead of the actual picture, and I can't get it to go back to how it was!

...That didn't make sense, did it? Here's a picture to demonstrate...



Does anyone know how I did this, or - more importantly - how I can change it back? It hurts my eyes!

Thank you very much!

EDIT: Fixed! Thank you SO much!