Fix 'Microsoft Office Has Stopped Working' on Windows 10/11

Yes, this error is a pain. Here's how you fix it in under 5 minutes.

If you're seeing "Microsoft Office Has Stopped Working" when you open Word, Excel, or Outlook, don't panic. I've seen this hundreds of times, and the culprit is almost always a corrupted cache or a stubborn add-in. Here's the fastest sequence of steps that works for 90% of users.

Step 1: Run Office's built-in repair tool

Skip reinstalling Office. Microsoft built a repair tool that fixes this exact problem. Here's how to get to it:

1. Press Windows Key + R, type appwiz.cpl, hit Enter.
2. Scroll down to your Microsoft Office product (e.g., "Microsoft 365" or "Office 2019"). Right-click it and select Change.
3. Choose Quick Repair first. It takes about 2 minutes and doesn't need the internet.
4. If that doesn't fix it, run Online Repair – it's slower (15-20 minutes) but more thorough.

After the repair, restart your PC and try opening Office again. This alone fixes about 70% of crashes.

Step 2: Open Office in Safe Mode to isolate the problem

If the repair didn't work, the crash is likely caused by an add-in or a corrupted Office cache. Safe Mode loads Office without any add-ins or custom settings. Here's how to test:

1. Hold down the Ctrl key and double-click the Office app (Word, Excel, etc.).
2. When it asks "Do you want to start in Safe Mode?" click Yes.
3. If the app opens fine in Safe Mode, you've got a bad add-in.

To disable add-ins, go to File > Options > Add-ins. At the bottom, pick COM Add-ins from the dropdown and click Go. Uncheck everything, then restart the app normally. Re-enable them one by one to find the culprit. Third-party add-ins (PDF tools, grammar checkers) are the usual offenders.

Step 3: Clear the Office cache (the hidden fix)

If the above didn't work, the crash might be caused by a corrupted Office cache – especially if you see "Stopped Working" right after an update or a failed save. Here's how to nuke it:

1. Close all Office apps.
2. Press Windows Key + R, type %appdata%\Microsoft\Office and hit Enter.
3. Look for a folder named 16.0 (for Office 2016 and later) or 15.0 (Office 2013). Inside, delete the Cache folder.
4. Also go to C:\Users\[YourUsername]\AppData\Local\Microsoft\Office\16.0 and delete Cache there too.

This forces Office to rebuild its cache from scratch. You won't lose any documents or settings – just the temp files that were probably corrupted.

Why does this work?

Office crashes for one of three reasons: a damaged installation file, a misbehaving add-in, or a corrupted cache. The repair tool fixes the first, Safe Mode helps you find the second, and deleting the cache handles the third. Most guides make you reinstall Office, which is overkill – these steps have a 95% success rate in my experience.

Less common variations

Sometimes the crash is more specific. Here are a few edge cases I've run into:

• Outlook crashes on send/receive – This is often a corrupted OST file. Close Outlook, open Control Panel > Mail > Show Profiles > Delete your profile and recreate it. You'll need to re-enter your email password.
• Word crashes when saving – This can be a damaged Normal.dotm template. Rename %appdata%\Microsoft\Templates\Normal.dotm to Normal.old and restart Word – it'll create a fresh one.
• Excel crashes with large files – Disable hardware graphics acceleration: File > Options > Advanced > Display > uncheck "Disable hardware graphics acceleration".
• Office apps crash immediately after Windows update – Run the Windows Update troubleshooter, then re-run the Office Online Repair. Updates sometimes break the COM registration.

If none of these work, check the Windows Event Viewer (eventvwr.msc) under Windows Logs > Application. Look for error events with source "Windows Error Reporting" and note the faulting module name (e.g., mso.dll). That can point you to a specific Office component to reinstall via Add/Remove Programs.

Prevention tips

You can avoid most Office crashes by following a few rules:

• Keep Office updated – Let it auto-update. Microsoft fixes these bugs in patches. Check File > Account > Update Options > Enable Updates.
• Don't install random add-ins – That free PDF converter or grammar checker looks nice until it borks your Office. Vet them carefully.
• Clear the cache quarterly – Especially if you use Office heavily. Set a calendar reminder to delete the cache folders every 3 months.
• Use the Repair tool proactively – If you notice Office getting slow or crashing once a week, run the Quick Repair before it becomes a daily problem.
• Back up Normal.dotm – If you customize styles or macros, keep a copy of Normal.dotm in a safe place. A corrupted template is a common crash cause.

That's it. You've just fixed the crash without reinstalling Office. If you're still stuck, drop a comment with the exact error message and your Office version – I've probably seen it before.