How to Make Excel 2003 the Default

1. Click 'Start' and type 'regedit' in the Windows search box. Click 'regedit.exe' from the list of files that appears.
2. Locate the 'HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Options' key and right-click on the 'Options' folder. Click 'New' and 'DWORD Value' and enter 'NoReReg' for the Dword Value. Right-click on the 'NoReReg' value that you created and click 'Modify.' Type '1' in the 'Value Date' box and click 'OK.'
3. Open Excel 2003 and select 'Detect and Repair' from the 'Help' menu. Click 'Start' and click 'OK' when the process finishes.