Troubleshooting

Find solutions to common Windows problems with our easy-to-follow troubleshooting guides. From Wi-Fi and display issues to system errors and slow performance, this section helps you fix everyday PC troubles step by step—no technical expertise required.

Windows 11「KB5068861」最新情報のアイキャッチ。青系の背景に4タイルのウィンドウ風アイコンと「Windows 11 KB5068861 – What’s New & Fixes (Nov 2025)」「OS Builds 26100.7171 / 26200.7171」などの文字を配置し、今回の更新内容（新スタートメニューUI・セキュリティ修正）をイメージで伝える。

2025-12-08

【2025年12月最新】Windows 11「KB5068861」最新まとめ：対象バージョン・ビルド番号・新UI（スタートメニュー）・既知の不具合と安全な導入手順

🟦 要点 🟦 11月の月例（Patch Tuesday）で公開された KB5068861 について、12月時点の情報を反映して解説します。対応OSビルドは 26100.7171（24H2） / 26200.7171（ […]

2025-09-10

How to Fix C Drive Permission Errors in Windows 11/10 (Restore TrustedInstaller & Default Settings)

Have you ever changed the security permissions on your C drive by mistake and suddenly found that apps won’t open, files are […]

Frustrated Windows 11 user facing PIN reset failure and missing verification code after 24H2 update.

2025-09-10

Windows 11 24H2 PIN Reset Failure and Missing Verification Code – Full Fix Guide

Introduction After installing the Windows 11 24H2 update, many users suddenly find themselves locked out of their PCs. The PI […]

Illustration of a woman staring at a laptop showing “Restarting…” at a home desk at night, looking concerned after an unexpected Windows reboot.

2025-08-20

Why Does My Windows PC Restart by Itself? Causes and Fixes (2025 Edition)

“My computer restarted in the middle of my work—without warning.” If this has ever happened to you, you know how frustrating […]

How to fix Realtek Audio RPC error with no sound on Windows 11 – step-by-step 2025 guide with icons for services, speaker, and USB DAC.

2025-10-03

How to Fix Realtek Audio RPC Error: No Sound on Windows 11 [2025 Guide]

How to Fix Realtek Audio RPC Error: No Sound on Windows 11 [Updated 2025 Guide] ※ This article contains affiliate links. For […]

A young woman looks shocked at a laptop showing the error “Windows could not start because a required file is missing or corrupt,” with USB and recovery icons in the background.

2025-12-03

How to Fix “A Required File Is Missing or Corrupt” Error in Windows – Step-by-Step Recovery Guide

Have you just seen this message on your screen? “Windows could not start because a required file is missing or corrupt” It’s […]

Illustration of a worried user looking at a Windows laptop showing a blue screen with the message “Your device ran into a problem and needs to restart.”

2025-11-25

Fixing the ‘Your Device Ran Into a Problem’ Error on Windows 11/10

What to Do When You See “Your Device Ran Into a Problem and Needs to Restart” on Windows Have you ever been using […]

Illustration of a confused user looking at a distorted PC screen after a Windows Update, with enlarged icons and blurry text, labeled “Fix Display Issues After Update”.

2025-11-25

How to Fix Display Issues After Windows Update (2025 Guide)

Windows Update Aftermath? Fix Display Problems Step by Step Have you ever thought, “Hmm, something looks weird on the screen… […]

Illustration showing a large yellow padlock and a frustrated user silhouette in front of a laptop screen displaying a BitLocker recovery message with the text “BitLocker Recovery Key Loop?”

2025-11-07

“Stuck in a BitLocker Recovery Key Loop? How to Unlock and Fix It (2025 Update)”

Last updated: Nov 7, 2025 Stuck in a BitLocker Recovery Key Loop? How to Unlock and Fix It (2025 Update) If your PC shows “En […]

Windows login error after update showing incorrect PIN and black screen with warning icons – Fix guide for 2025

2025-11-25

Can’t Log In After a Windows Update? Full Fix Guide for PIN Errors, Black Screens, and Profile Issues (2025 Edition)

Can’t Log In After a Windows Update? Here’s a Complete Guide to Fix Login Issues (2025 Edition) After recent Windows updates, […]