How to Disable a Macro in Excel 2003

1. Open Excel 2003. Select 'Tools' on the menu bar. Click 'Macro' and 'Security.' The Macro Security dialog box appears.
2. Select 'High.' This will disable all macros that are not from a trusted source. Select 'Very High.' This will only allow macros to run if they are in a trusted location. So using these two choices will disable any macros that are not from trusted source or in a trusted location.
3. Click 'OK' to confirm the macro security changes in Microsoft Excel 2003.