OneNote Not Opening in Windows 10: How to Fix It

Tech & Gaming
1

OneNote not launching – either nothing happens when you click it, it opens and immediately closes, or it gets stuck on a loading screen – usually has one of a handful of specific causes. Here’s the fix process.

Fix 1: End OneNote processes and relaunch

OneNote sometimes has background processes running that prevent a clean launch. Open Task Manager > look for any OneNote processes > end them all. Wait a few seconds, then try launching OneNote again.

Fix 2: Run as administrator

Right-click the OneNote shortcut or .exe > Run as administrator. This resolves permission-related launch failures that don’t produce a visible error.

Fix 3: Clear OneNote’s cache

A corrupted cache is a common cause. Navigate to:
%LocalAppData%\Microsoft\OneNote

Inside this folder, find the version-specific subfolder (e.g., 16.0) and delete the cache folder inside it. OneNote rebuilds the cache on next launch.

For OneNote (Microsoft Store version): Settings > Apps > OneNote > Advanced options > Reset. This clears the app’s cached data without uninstalling it.

Fix 4: Repair Office installation

For Office-installed OneNote (part of Microsoft 365 or Office 2019/2021): Control Panel > Programs > Microsoft Office > Change > Quick Repair. If Quick Repair doesn’t resolve it, try Online Repair, which is more thorough but requires an internet connection.

Fix 5: Check for conflicting add-ins

OneNote for Windows 10 supports add-ins that can cause launch failures if they’re broken. In OneNote: File > Options > Add-ins > Manage: COM Add-ins > Go. Uncheck all add-ins, restart OneNote, and re-enable them one at a time.

Fix 6: Reinstall OneNote

For the Microsoft Store version: Settings > Apps > OneNote > Uninstall, then reinstall from the Store. Your notebooks are stored in OneDrive and are not affected by reinstalling the app.

For the Office version: the cleanest path is using the Office uninstall support tool from Microsoft’s support site, then reinstalling from your Microsoft 365 account.

Fix 7: Check OneDrive sync status

OneNote stores notebooks in OneDrive. If OneDrive is in an error state, OneNote may hang trying to sync on launch. Check the OneDrive icon in the taskbar for errors and resolve any sync issues.

2

OneDrive being in an error state causing OneNote to hang on launch is the connection most people don’t make. they troubleshoot onenote when the real issue is onedrive. checking the taskbar icon for onedrive sync errors first is faster than going through the full onenote troubleshooting sequence.

3

Office Quick Repair being fast and non-destructive makes it worth trying for any Office app issue, not just OneNote. It checks and replaces corrupted Office files without affecting documents or settings. Takes a few minutes and resolves a wide range of Office launch and stability problems.

4

the notebooks being in onedrive and surviving reinstall is reassuring. people are nervous about uninstalling onenote because they’re afraid of losing their notes. knowing the notes are server-side in onedrive and the reinstall only touches the app makes it a safe option to try.

5

The two different OneNote versions – the Microsoft Store version and the Office-installed version – having different troubleshooting paths is something that confuses people. They’re separate apps with separate cache locations and different repair mechanisms. Identifying which version you have before troubleshooting is the right first step.

6

The cache clear fix works for OneNote more often than it should. Clearing the cache folder in LocalAppData and relaunching resolves a lot of OneNote issues including not just launch failures but also sync problems and display glitches. It’s a low-risk first step.