Windows Resource Protection did not find any integrity violations. You do not have any missing or corrupted system files. Windows Resource Protection could not perform the requested operation. To resolve this problem, perform the System File Checker scan in safe mode.

Starting in early August 2021, Microsoft set PUA protection to be on by default to make it easier for you to keep your systems performing at their best. To manage PUA protection on your device, in the Windows Security app, go to App & browser control > Reputation-based protection.

If you're having problems with an app you got from Microsoft Store, go to Fix problems with apps from Microsoft Store. The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs. It also fixes corrupted registry keys. First, you'll need to download the ...

Each release of the tool helps detect and remove current, prevalent malicious software. This malicious software includes viruses, worms, and Trojan horses. Microsoft uses several metrics to determine the prevalence of a malicious software family and the damage that can be associated with it.

Learn how to identify, remove, and prevent unwanted software on your PC.

Solve problems with detecting and removing malware with Windows Security, including incomplete scans, detection errors, and persistent malware.

If the app is believed to be malicious or potentially unwanted, then Smart App Control will block it. If the security service is unable to make a confident prediction about the app, then Smart App Control checks to see if the app has a valid signature.

We recommend that you leave this feature on, and that you enable both block apps and block downloads. Block apps will detect PUA that you've already downloaded or installed, so if you're using a different browser Windows Security can still detect PUA after you've downloaded it.

Troubleshoots and fixes common issues with security and malware prevention in Windows.

The App & browser control page in the Windows Security app provides security settings that help protect your Windows device from unsafe apps, files, websites, and downloads by using reputation‑based protection and exploit mitigation.