Will resetting the Store remove my apps?

No, resetting clears cache and settings but installed apps remain. You may need to sign in to the Store again.

What if the error persists after reset?

Try creating C:\Windows\temp\AUInstallAgent and C:\Windows\temp\AppReadiness folders manually — these are sometimes missing.

Windows Store Error 0x80073CF9 — App Installation Failed

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Overview

Windows Store error 0x80073CF9 means an app installation or update failed, typically due to corrupted Store cache, disk space, or Windows Store service issues.

Key Details

Error 0x80073CF9 occurs during Microsoft Store app installation or update
The Store cache may be corrupted, preventing package deployment
Insufficient disk space on the system drive can trigger this error
Windows Store service components may need resetting
AppX deployment service may be stuck or malfunctioning

Common Causes

Corrupted Microsoft Store cache files
Insufficient disk space on C: drive for app installation
Windows Store service (WSService) or AppX Deployment Service malfunction
Antivirus blocking Store app package deployment
Damaged Windows Store app registration

Steps

1Reset Store cache: press Win+R, type wsreset.exe, press Enter — wait for Store to open
2Ensure at least 10GB free space on C: drive
3Re-register Store apps: PowerShell (admin) > Get-AppxPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
4Reset Microsoft Store: Settings > Apps > Microsoft Store > Advanced options > Reset
5Create AUInstallAgent and AppReadiness folders in C:\Windows\temp if they do not exist