I'm sorry you're experiencing this issue. It seems to be a common problem after updating to Windows 11 24H2. Here are some solutions that might help:
- Reset Default Apps: Go to Settings > Apps > Default apps and reset all default apps. This has worked for some users.
- Repair Office: You can try repairing your Office installation. Go to Control Panel > Programs and Features, select Microsoft Office, and choose Quick Repair or Online Repair.
- Uncheck DDE Option: Open Excel, go to File > Options > Advanced, scroll down to the General section, and uncheck "Ignore other applications that use Dynamic Data Exchange (DDE)".
- Reinstall Office: If the above methods don't work, you might need to uninstall and reinstall Office.
- System Restore: As a last resort, consider restoring your system to Windows 11 23H2, which has been reported to resolve the issue.
If these steps don't resolve the problem, you might want to check for updates or patches from Microsoft, as they are aware of this issue and may release a fix soon.
Let me know if you need further assistance!