Brackets for negative numbers

Hello
Just got a new computer with MS office 2013 and Win 7, but my excel will not show me brackets on my negative numbers unless I change the format for the cells each time?? I have gone into my Regional setting and set both the negative number format and the negative currency format to show brackets, then I closed all programs and restarted my machine. But my negative numbers still show with the - sign?? Why?? Can this be changed? Thanks for your help