small problem with editing

[#1]

Hi there.

Can anybody help me? I pressed something or choose some option / options by mistake when I been working last time with my photo and I created quite specific n unwanted mask on it (please see attached pic). Now I cant stop / avoid this option when editing another pics n its (this mask) appearing automatically. I just started using PE n I dont know too much about computers so please give me clear step by step instruction.

Thank you very nuch.

[#2]

Oh that's supposed to be there you can't turn it off.  Just kidding.  Go to your "View" menu and uncheck "Grid"