It's possible that the right-click feature in Excel 2007 has been disabled or there may be an issue with the mouse or touchpad settings. Here are some steps you can take to troubleshoot the issue:

1. Check if the right-click feature is enabled in Excel:
   • Click on the Office button in the top left corner of the Excel window
   • Click on Excel Options at the bottom of the menu
   • Click on Customize in the left-hand menu
   • Under "Choose commands from" select "All Commands"
   • Scroll down and check if "Enable Selection" is listed. If it is, select it and click "Add" to add it to the Quick Access Toolbar. If it's not listed, the right-click feature is already enabled.
2. Check the mouse or touchpad settings:
   • Go to the Control Panel on your computer
   • Click on "Hardware and Sound"
   • Click on "Mouse" or "Mouse and Touchpad"
   • Check if the right-click button is set to the correct function. If not, adjust the settings accordingly.
3. Try using a different mouse or touchpad to see if the issue persists.
4. If none of the above steps work, try repairing or reinstalling Microsoft Office 2007.

I hope these steps help you resolve the issue with the right-click feature in Excel 2007. Let me know if you have any other questions or concerns!