Why am I seeing error messages when I try to open my Excel file?

1. Verify you have the correct version of Microsoft Excel installed.
2. Check disk space to make sure you have enough to open the Excel file (see your operating system’s requirements).
3. Close any applications that are using the same file, including the source Excel file.
4. Quit any programs that are using the same file, including the source Excel file.
5. Check the file permissions to ensure you have the correct access rights.
6. Add more RAM, if applicable.
7. Update your virus protection to the latest version.
8. Run a scan on your computer to check for malicious software.
9. Reinstall Microsoft Excel if necessary.