Why Did Windows Defender Fail to Start?
Windows Defender is a popular antimalware program developed by Microsoft. It primarily helps to protect your computer against spyware. While Windows Defender generally performs well, various bugs and related issues could prevent it from launching successfully.
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Service Malfunction
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The "Windows Defender" service may be set to "Manual" or disabled. Visit the "Services.Msc" from the Start menu's Search box. Set the "Windows Defender" entry to "Automatic." This typically solves the problem, although alternative solutions also are available for rare occasions.
Active Process
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If Windows Defender was running previously, its proprietary process may remain active in the system's background. This generally is an operating system malfunction. End the Windows Defender process within the Task Manager or restart your computer to eliminate this issue.
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Program Malfunction
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A number of services shared by Windows Defender might cause it not to launch, such as the simultaneous use of any given antimalware program. Also, Windows Defender might have failed to install properly on your computer. Close all open programs and re-install it to troubleshoot and determine the problem.
Infection
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Spyware is able to cause an antimalware program to malfunction to prevent it from performing its job. Re-install Windows Defender or perform a thorough system scan using Windows "Safe Mode" to troubleshoot the bug in question.
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