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Welcome Buddhika Aththanayake,
Thank you for posting in Microsoft Q&A.
"Windows Security not working" can refer to several different issues, such as the app not opening, showing a blank screen, displaying an error message, or reporting that protection is turned off. Could you let us know exactly what happens when you open Windows Security? If there is an error message, please share the wording or a screenshot.
In the meantime, please try these quick checks:
Option 1: Open Services
- Press Windows + R > type
services.mscand press Enter - Verify that Security Center is running and its startup type is not set to Disabled.
Option 2: Restart the Windows Security app:
- Open Settings > Apps > Installed apps
- Find Windows Security
- Select Advanced options > Repair
Option 3: Run a system file check:
- Open Command Prompt as Administrator
- Run:
sfc /scannow
Option 4: Restart the computer after the scan completes and check whether Windows Security opens normally.
If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".
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