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Fix Windows Defender Service Not Starting Error - Fix Firefox Not Responding When Opening a New Tab-Fix Windows Update Error 0x80070643: Practical Steps

2026-06-13 13:03:26
Fix Windows Defender Service Not Starting Error - Fix Firefox Not Responding When Opening a New Tab-Fix Windows Update Error 0x80070643: Practical Steps

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

Fix npm Permission Denied and EACCES Cache ErrorsFix Windows Defender DNS Error on Windows 10Checklist to Fix Windows Update Port Allocation ErrorHow to Fix Windows Update Error 0x80070005 Step by StepHow to Fix 'Windows Defender Module Not Found' ErrorHow to Turn Off Windows Defender Real-Time Protection Permanently