Excel crashes can be frustrating, but there are several troubleshooting steps you can try to get it working again. Here are some methods you can attempt, starting from the most basic:

1. Restart Excel: Sometimes a simple restart can resolve temporary glitches. Close Excel entirely and then reopen it.

2. Update Excel: Outdated software can sometimes cause crashes. Check for updates for Microsoft Office. Here's the general process (specific steps might vary slightly depending on your version):

- Open any Office application like Excel or Word.
- Go to "File" > "Account" (or "Office Account").
- Under "Update Options," click "Update Now" to install any available updates.

3. Safe Mode: Try opening Excel in Safe Mode. This disables add-ins and some functionalities, helping identify if an add-in is causing the crash. Here's how to do it:

- Close Excel if it's running.
- Press and hold the Ctrl key while double-clicking the Excel shortcut icon or opening the program from the Start menu.
- A message will pop up asking you to confirm opening in Safe Mode. Click "Yes."
- If Excel works fine in Safe Mode, then the issue likely lies with an add-in.

4. Disable Add-ins: If Safe Mode resolves the crash, you can pinpoint the problematic add-in by disabling them one by one. Here's how:

- Open Excel normally (not in Safe Mode).
- Go to "File" > "Options" (or "Excel Options").
- Click on "Add-Ins" in the left pane.
- In the "Manage" dropdown menu at the bottom, select "COM Add-Ins" and click "Go."
- Uncheck the boxes next to any add-ins you suspect might be causing issues. Click "OK" to close the window.
- Restart Excel and see if the crashing persists. If it does, repeat the process, disabling one add-in at a time until you identify the culprit.

5. Repair Office Installation: If none of the above methods work, consider repairing your Office installation. This can fix corrupted files within the program. Here's the general process (specific steps might vary):

- Go to your Control Panel or Settings menu (depending on your Windows version).
- Find "Programs and Features" or "Apps & features."
- Locate Microsoft Office on the list.
- Click "Modify" or "Change" depending on your version.
- Choose the "Repair" option and follow the on-screen instructions.

6. Check for Corrupted Files: If the crash only happens with a specific Excel file, it might be corrupted. Try opening other Excel files or creating a new one to see if the crash persists.

7. Advanced Troubleshooting: If these basic methods don't solve the issue, you might need to explore more advanced troubleshooting steps. Here are some resources that might be helpful:

- Microsoft Support on Excel crashing: [https://support.microsoft.com/en-us/office/excel-not-responding-hangs-freezes-or-stops-working-37e7d3c9-9e84-40bf-a805-4ca6853a1ff4](https://support.microsoft.com/en-us/office/excel-not-responding-hangs-freezes-or-stops-working-37e7d3c9-9e84-40bf-a805-4ca6853a1ff4)
- Troubleshooting steps for various Excel issues: [https://techcommunity.microsoft.com/t5/excel/bd-p/ExcelGeneral](https://techcommunity.microsoft.com/t5/excel/bd-p/ExcelGeneral)

Remember, if none of these solutions work, it's advisable to seek help from Microsoft support or a qualified technician.