How to Fix the “Excel Couldn’t Start Last Time” Error on Windows

If Microsoft Excel opens with the message “Excel couldn’t start last time,” it usually means something in the previous startup failed. In many cases, the problem is caused by a bad add-in, a damaged startup file, or a Microsoft Office installation issue rather than Excel itself being completely broken.

The fixes below start with the most likely and least disruptive solutions first, so you can get Excel working again without making unnecessary changes.

1. Start Excel in Safe Mode and Disable Problem Add-ins

Excel Safe Mode loads the program with only the essential files. If Excel opens normally in Safe Mode, the error is often being triggered by an add-in or a custom startup item.

1. Press Windows + R to open the Run dialog.
2. Type excel /safe and press Enter.
3. If Excel opens, go to File > Options > Add-ins.
4. At the bottom of the window, choose COM Add-ins from the Manage box, then click Go.
5. Clear the checkboxes for suspicious or recently added add-ins, then click OK.
6. Close Excel and open it normally to test again.

2. Clear the Excel Startup Folder

Excel automatically loads files and templates from its startup folder. A damaged workbook, template, or stray file in that location can cause startup problems and trigger the error message.

1. Press Windows + R.
2. Type %appdata%\Microsoft\Excel\XLSTART and press Enter.
3. If the folder opens, move any files inside it to another folder as a backup.
4. Also check the Office startup folder if it exists on your system, such as the XLSTART folder under Program Files.
5. Open Excel again and see whether the error is gone.

3. Repair Microsoft Office

If Excel still shows the error after checking add-ins and startup files, the Office installation itself may be damaged. Repairing Office can replace missing or corrupted program files without removing your documents.

1. Open Settings in Windows.
2. Go to Apps > Installed apps or Apps & features.
3. Find Microsoft 365 or Microsoft Office in the list.
4. Select Modify or Advanced options, depending on your Windows version.
5. Choose Quick Repair first and follow the prompts.
6. If the problem remains, run Online Repair for a deeper fix.

4. Reset Excel’s User Settings or Test a New Profile

If Excel is still failing, the issue may be tied to your user profile, such as a corrupted settings file or profile-specific configuration. Testing with a different Windows account can help confirm this.

1. Create a new local Windows user account, or sign in with another existing account on the PC.
2. Open Excel from that account and check whether the error appears.
3. If Excel works there, your original user profile is likely damaged.
4. You can then copy your files to the new profile or repair the affected profile settings.
5. If the error happens in every account, the problem is more likely with Office or a shared startup component.

What Usually Causes This Error?

• Faulty Excel or COM add-ins
• Damaged startup templates or files in the XLSTART folder
• Corrupted Office program files
• Problematic user profile settings
• Leftover components from older Office installs

If the error only appears after a recent change, that change is a strong clue. A new add-in, a freshly installed template, or an Office update can all be useful places to investigate.

Which Fix Should You Try First?

Start with Safe Mode and add-ins, because they are the most common cause and easiest to reverse. If that does not help, move on to the startup folder, then repair Office, and finally test the user profile. Together, these four fixes solve most “Excel couldn’t start last time” problems on Windows without requiring a full reinstall.