Numbers in Parenthesis

I have just purchased a netbook an installed Excel 2003 on it. I have copied all my Excel data files from my desktop where all negative numbers are in parenthesis. The files in the netbook, however, are showing a negative sign. I have customised the Regional Settings so that negative numbers and currency are in parenthesis, however, these options do not appear when I choose Format, Cells Numbers or Currency - only the negative sign option is shown. How do I get a general change so that all negative numbers in all Excel worksheets can be in parenthesis.

I apparently didn't complete the final step when making the changes in the Regional and Language Settings Window. After making the changes from Customised Settings, you have to select the Advanced tab. At the bottom, you have to check the box that says "Apply all settings to the current user account and both default user profile."