Try these steps in order:
- Restart the PC.
- Go to Start > Power > Restart.
- This can sometimes stop the pop-up long enough to remove the app.
- Uninstall PC APP STORE from Settings.
- Open Start > Settings > Apps > Installed apps.
- Find PC APP STORE.
- Select it, then choose Uninstall.
- Follow the on-screen prompts.
- If Advanced options is available, try Repair first, then Reset.
- Go to Start > Settings > Apps > Installed apps.
- Select PC APP STORE > Advanced options.
- Select Repair.
- If the issue continues, select Reset.
- Note: Reset may remove app data.
- If uninstall fails, run the Program Install and Uninstall troubleshooter.
- Download the troubleshooter.
- When prompted, select Run or Open.
- Follow the steps to fix problems that prevent a program from being uninstalled.
- This troubleshooter can fix corrupted registry keys, incomplete uninstall information, and other issues that block removal.
- If the app may be unwanted software, run a security scan.
- Open Windows Security.
- Update security intelligence.
- Run a full scan with Microsoft Defender Antivirus.
- If the unwanted software persists, run Microsoft Defender Offline.
To avoid similar apps in the future, install apps only from trusted sources, keep Windows updated, and use Microsoft Defender Antivirus.