I used Winaero Tweaker to disable Windows Defender, but after rebooting and using the computer for a while, Defender eventually starts running again at full power. The setting remains disabled in Winaero Tweaker, yet I can still open Windows Security from the app. Could the Windows Defender Core service or another Windows security component be reactivating it? Is there a reliable way to prevent this, or should I troubleshoot the memory issue another way?
3 Answers
Some support communities generally recommend keeping Windows Defender enabled because disabling the built-in security stack can cause update and protection problems. Check Task Manager to identify what is consuming memory, and consider adding RAM or using a lighter operating system if the hardware cannot handle the workload.
If the main reason is that the computer runs low on memory, it may be better to investigate RAM usage, startup programs, and background processes instead of turning off antivirus protection. Windows 11 can feel very sluggish with only the minimum supported memory, especially once hardware-reserved memory and other applications are included.
Windows regularly restores Defender through its security services and updates, so tweak-based disabling may not remain effective. If you still decide to use a third-party Defender removal tool, create a restore point first and download it only from a trustworthy, verifiable source. Keep in mind that disabling built-in protection leaves the system more exposed.
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