Windows guides
How to Boot Windows 10 into Safe Mode
Step-by-step Windows 10 Safe Mode instructions using Windows Recovery Environment, including Safe Mode with Networking and recovery-media options.
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Advanced startup
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Troubleshooting
Fix 'Your PC Did Not Start Correctly' in Windows 10
Use Windows Recovery Environment to repair the 'Your PC did not start correctly' loop in Windows 10 without jumping straight to destructive reset steps.
Windows guides
Use Windows Memory Diagnostic to Test RAM — Historical Guide
Guide to running Windows Memory Diagnostic on legacy Windows systems to check for memory errors, including Standard and Extended test options.