Security– Category –
This site covers all the important information you need to protect your PC from threats, from setting up and explaining standard Windows security features (such as Microsoft Defender and BitLocker) to virus and malware countermeasures. It also provides urgent vulnerability information and security update alerts for browsers and third-party applications (software made by other companies) in addition to the Windows OS itself.
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Windows 11 won't boot? "Secure Boot 2023 Signature" issue and how to create a repair tool
The Windows 11 preview update KB5074105, released on January 29, 2026, and the next official update will complete the preparation phase and include Secure Boot... -
Windows Security: The Complete Guide to App and Browser Control
This is the latest installment in our Windows Security series, covering "App and Browser Control." This section covers how to manage files and apps downloaded from the internet, as well as W... -
Windows Security: Firewall and Network Protection: The Complete Guide
"Windows Security" is a standard feature of Windows 11. Among its features, "Firewall" acts as a "gatekeeper" that prevents unauthorized access from outside and protects your PC. -
Windows Security: The Complete Guide to Protecting Your Accounts
When it comes to using Windows 11 safely, "protecting your account" is just as important as "virus and threat protection." Many users think, "Just because there's a green check mark..." -
Windows Security: The Complete Guide to Virus and Threat Protection
The "Virus & threat protection" page in the "Windows Security" app in Windows 11 helps you protect yourself from viruses, malware (malicious software), and ransomware (ransom demands). -
[Solved] Mouse and keyboard not working issue in WinRE fixed with KB5070773
Microsoft has recently released a fix for a serious issue that has been plaguing many Windows 11 users: USB mice and keyboards becoming unresponsive in the Windows Recovery Environment (WinRE). -
Mouse and keyboard not responding in Windows Recovery Environment (WinRE)? The cause is KB5067039
[For English Readers] This article explains a bug where the mouse and keyboard do not work in the Windows Recovery Environment (WinRE) after a Windows Update... -
ASRock B550M Pro4 Motherboard BIOS Update Method and Notes
The PC I use is a BTO PC purchased from PC Koubou, and it has an ASRock B550M Pro4 motherboard. I'm using an ASRock B550M Pro4 motherboard... -
PIN may become unusable or password may be lost after Windows Update
Windows Update is used to keep Windows security up to date. However, after updating, I was unable to sign in with my PIN and my saved passwords (credentials) were lost. -
[It's not just someone else's problem!] Is your PC being targeted? The threat of increasingly sophisticated cyber attacks and how to protect yourself
In recent years, there has been a constant stream of news about cyber attacks targeting major companies and government agencies. You may be thinking, "It doesn't concern me," or "It's only a problem for large companies." Actually, that's not true... -
How to check the version and expiration date of Windows Secure Boot certificate
Do you have Secure Boot enabled on your Windows 10/11 PC? In fact, some of the certificates currently used on many PCs will begin to expire in 2026. This... -
[Windows 10/11] What is Microsoft Defender SmartScreen? A comprehensive guide from how to set it up to the risks of disabling it
Have you ever felt uneasy when your browser displayed warning messages like "This website may not be secure" or "This file is not safe to download"?