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Understand Secure Boot, what startup threats it blocks, how to check Secure Boot State, how to enable it in UEFI, and how it differs from TPM and antivirus.

Understand DLL files on Windows, why missing DLL errors happen, and how to fix them safely without downloading random DLL files.

Fix VIDEO_TDR_FAILURE by clean reinstalling graphics drivers, disabling hardware acceleration in problem apps, undoing overclocks, checking GPU temperatures, understanding TdrDelay, checking PSU power, and testing GPU hardware.

Understand the main causes of Windows blue screens: drivers, RAM, storage, overheating, hardware upgrades, corrupted system files, low-level software conflicts, malware, and stop codes.

Fix SYSTEM_SERVICE_EXCEPTION blue screens by matching crashes to graphics, network, or audio drivers, running SFC and DISM, installing or uninstalling updates, reading minidumps, testing antivirus and RAM, and resetting Windows if needed.

Restore a missing Windows taskbar by disabling auto-hide, restarting Explorer, checking monitors and full-screen apps, updating graphics drivers, testing profiles, and running SFC.

Fix a visible but frozen Windows 10 taskbar by restarting Explorer, testing a new local profile, running SFC, installing updates, checking misbehaving tray apps, updating graphics drivers, and using PowerShell only as a last resort.

Understand BIOS vs UEFI, GPT vs MBR, Secure Boot, CSM, Windows 11 requirements, and how to check BIOS Mode from Windows.

Fix no sound on Windows by checking mute, output devices, the audio troubleshooter, drivers, Windows Audio service, sample rate, cables, HDMI output, and recent updates.

Fix a frozen Windows 10 Start menu by restarting Explorer, running Windows Update troubleshooter, re-registering ShellExperienceHost, testing a new user profile, and running SFC.