Windows 11 Error 0x803F8001 Notepad and Snipping Tool Not Working

What is Windows 11 Error 0x803F8001?

Error 0x803F8001 is a Microsoft Store licensing validation error that prevents Windows 11 apps from launching. After the January 2026 Patch Tuesday update (KB5074109), this error began affecting core Windows apps including Notepad, Snipping Tool, Paint, Xbox, Alienware Command Center, and Nitrosense. Users see the error message "This app can't open" accompanied by "File system error (-2143322111)."

The root cause is a bug in KB5074109 that corrupts the Microsoft Store license cache, preventing Windows from verifying that installed apps are properly licensed. Microsoft has acknowledged the issue and released emergency patches.

When does it occur?

• After installing the January 2026 security update KB5074109
• When opening Notepad, Snipping Tool, Paint, or other Microsoft Store apps
• After a Windows restart following the KB5074109 update
• When the Microsoft Store cache becomes corrupted
• On Windows 11 23H2, 24H2, and 25H2 builds (26100.7623 and 26200.7623)
• When Microsoft account sync encounters temporary authentication issues

Common causes

• January 2026 Patch Tuesday update KB5074109 corrupting app license validation
• Corrupted Microsoft Store cache preventing license checks
• Microsoft account sync failure after the security update
• Windows component store inconsistencies after patching
• App package registration data becoming corrupted during the update process
• Conflict between the security update and existing Microsoft Store app packages
• Cloud storage sync issues (OneDrive, Dropbox) introduced by the same update

Step-by-step fixes

1. Install the emergency out-of-band patches — Go to Settings > Windows Update > Check for updates. For Windows 11 24H2/25H2, install KB5077744. For Windows 11 23H2, install KB5077797. If you also have cloud storage freezing issues, install KB5078127 as well. Restart your PC after installation.

1. Reset the Microsoft Store cache — Press Win + R, type wsreset.exe, and press Enter. Wait for the Store window to open automatically. This clears the corrupted license cache that causes the 0x803F8001 error.

1. Terminate and relaunch the affected app — Go to Settings > Apps > Installed Apps, search for the broken app (e.g., Notepad), click the three-dot menu, select Advanced options, then click Terminate. Try opening the app again.

1. Sign out and back into the Microsoft Store — Open the Microsoft Store, click your profile icon in the top right, select Sign out. Close the Store, reopen it, and sign back in with your Microsoft account. This forces a license re-validation.

1. Uninstall and reinstall the affected app — Right-click the app in the Start menu and select Uninstall. Then search for the app name in the Start menu — the .exe installer link will appear. Click it to reinstall from the Microsoft Store.

1. Reset the Microsoft Store app — Go to Settings > Apps > Installed Apps > Microsoft Store > Advanced options. Click Repair first. If that does not work, click Reset. Restart your PC and try opening the affected apps.

1. Run the Windows Store Apps troubleshooter — Go to Settings > System > Troubleshoot > Other troubleshooters and run Windows Store Apps. This detects and fixes common app registration and licensing issues automatically.

1. Re-register all Store apps via PowerShell — Open PowerShell as administrator and run: Get-AppxPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}. This re-registers all app packages and fixes corrupted registrations.

If it still doesn't work

If the error persists after trying all fixes, you can temporarily uninstall KB5074109 by going to Settings > Windows Update > Update history > Uninstall updates. However, this removes important security patches, so reinstall it after Microsoft releases the next cumulative update (expected February 10, 2026 Patch Tuesday). For the related cloud storage freezing bug affecting Outlook and OneDrive, move affected PST files to a local (non-synced) folder as a workaround until KB5078127 is installed. Monitor the Microsoft support page for KB5074109 for additional known issues and fixes.