However, many users have reported that their Windows Defender can't be turned on for virus defense in Windows 10/8/7 when they click on the Turn on button. Once it scans and finds potential threats, this program will stop them. It can offer real-time protection from various threats like spyware, malware, and viruses to your PC. Windows Defender (also called Windows Defender Security Center in Windor later), a fully integrated part of Windows, is an antivirus program. Windows Defender Will Not Turn on Windows 10/8/7
