Windows 11 includes a deeply embedded security layer known as Microsoft Defender SmartScreen. This background filter acts as a constant gatekeeper for software installations. Whenever you download a new `.exe` or `.msi` file from the internet and attempt to run it, SmartScreen intercepts the execution. It cross-references the file’s digital signature against a massive Microsoft database. If the app is obscure, newly released, or created by an independent developer who hasn’t paid for an expensive code-signing certificate, SmartScreen throws a massive, alarming blue popup declaring: “Windows protected your PC,” actively blocking the installation.
While this is an excellent safeguard for novice users who might be tricked into downloading malware, it is an incredibly frustrating roadblock for developers, IT professionals, and power users who frequently download and test unsigned, open-source niche software from GitHub. If you are confident in your ability to identify safe software and are tired of clicking “More info” followed by “Run anyway” for every single independent app you download, you can completely disable the SmartScreen filter.
Disabling SmartScreen via Windows Security
You can turn off this execution block directly through the main Windows Security dashboard.
- Click the Start button and type “Windows Security” into the search bar. Press Enter to open the application.
- In the left-hand navigation menu of the Windows Security app, click on App & browser control.
- In the main panel, look for the section labelled “Reputation-based protection.” Click the blue link text that says Reputation-based protection settings.
- You will now see a list of different SmartScreen filters. The most aggressive one is at the very top, labelled Check apps and files. This is the filter that blocks unsigned `.exe` files.
- Click the toggle switch to turn “Check apps and files” Off.
- A User Account Control (UAC) prompt will appear asking if you want to allow this app to make changes to your device. Click Yes.
- (Optional) If you also want to stop Microsoft Edge from warning you before the download even finishes, you can scroll down and toggle SmartScreen for Microsoft Edge to Off as well.
Once disabled, Windows will no longer query Microsoft’s servers when you attempt to install a new program. The moment you double-click a newly downloaded executable file, the installer will launch instantly, granting you full, unhindered control over what software runs on your machine.