How to Reinstall the Windows Security Module
If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...
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If your PC fan is spinning up and Task Manager shows SearchIndexer.exe using high CPU, the search...
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When you try to open Windows Defender and see a message like "This app is blocked by group policy...
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If Outlook cannot connect to your email server and you suspect your firewall is blocking it, you’...
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When you try to open Windows Security (formerly Windows Defender Security Center) and see a messa...