Free for everyone. Open source. Windows 10/11.
Download ClamAV from clamav.net and extract to C:\ClamAV\. Then run freshclam.exe to download virus definitions.
Download the Threat-Op installer from GitHub releases and double-click to install. It adds a Start menu shortcut automatically.
Open Threat-Op from the Start menu. The green dot confirms ClamAV is online. Click Quick scan PC to start your first scan.
Run the screensaver installer, then go to Desktop → Personalize → Lock screen → Screen saver settings and select Threat-Op.