How to Upgrade for Excel 2003

Upgrade to Office 2007
1. Insert your Microsoft Office 2007 installation disk, or double-click the 'Setup.exe' file in the installation pack you downloaded from an online retailer.
2. Enter your 25-digit Product Key when prompted and click 'Continue' when a green check mark appears.
3. Check the box to accept the license agreement and click 'Continue.'
4. Select 'Upgrade' from the installation options.
5. Wait as the program installs. It may take 15 minutes or more to finish installing.
6. Restart the computer when prompted.
Upgrade to Office 2010
7. Insert your Office 2010 installation disk and click 'Customize.'
8. Select 'Remove all previous versions' to remove Office 2003 and click 'Upgrade.' This will uninstall Office 2003, but it will not not delete any of your Office documents.
9. Click 'Upgrade' again to begin installation, which may take 15 minutes or more to finish.
10. Click 'Close' to exit the installer.