Web Reference: Jun 26, 2024 · Temporarily disable or uninstall any third-party antivirus software and try opening Windows Security again. Please try these steps one at a time and let me know if any of them resolve the issue. Aug 30, 2025 · Windows Security not opening is frustrating but rarely catastrophic. A methodical approach — quick restart and update checks, app repair/reset, PowerShell re‑registration, DISM + SFC, and cautious policy or AV conflict resolution — restores functionality in most cases while keeping your data intact. These kinds of issues are visible even with minor changes made by users in any application settings. As a result, it’s a good idea to reset or repair the application in order to fix this. Let’s have a look at how to reset the Windows Security application in this article.
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