It scans your PC in real-time for malicious software, and it is automatically disabled once you have installed an antivirus software on your system. Are you interested in learning how to disable Windows Defender? There are two ways do do this, one will disable Windows Defender Windows 10 temporarily and the other will disable How to temporarily disable Windows Defender? Windows 10 includes Windows Defender, a built-in antivirus software that's a first line of defense against malware infections.