Knowledge Base & FAQ
Frequently Asked Diagnostic Questions
Quick technical answers to the most common Windows troubleshooting questions, error messages, and native tool behaviors.
Why does Task Manager show 100% CPU usage when idling?
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100% CPU usage while idling is commonly caused by background Windows Search Indexing, telemetry maintenance, corrupted third-party updaters, or System Interrupts resulting from faulty hardware drivers. Sort the CPU column in Task Manager to isolate the specific process. Check out our Task Manager Diagnostic Guide for step-by-step instructions.
What is the difference between SFC and DISM?
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SFC (System File Checker) scans and replaces damaged Windows DLLs using local cached copies in the WinSxS directory. DISM (Deployment Image Servicing and Management) fixes the WinSxS component store itself by downloading fresh, verified binaries directly from Microsoft Windows Update cloud servers. Always run DISM first before SFC! Read the SFC & DISM Repair Tutorial.
What does Event ID 41 Kernel-Power mean in Event Viewer?
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Event ID 41 indicates that the system rebooted without shutting down cleanly first. This occurs during a Blue Screen of Death (BSOD), a sudden loss of electrical power, or a thermal shutdown. Check the BugcheckCode in the event details to decode the exact crash reason. Read our Event Viewer BSOD Guide.
How do I know if my computer RAM is failing?
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Failing RAM manifests through recurring MEMORY_MANAGEMENT or PAGE_FAULT_IN_NONPAGED_AREA blue screens, frequent browser tab crashes with STATUS_ACCESS_VIOLATION, and silent file corruption. Running mdsched.exe (Windows Memory Diagnostic) tests physical RAM cells for read/write errors. Learn how in our RAM Diagnostic Guide.
Are third-party "PC Booster" and registry cleaner apps safe?
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Most third-party 'one-click PC cleaners' and 'driver boosters' are unnecessary and potentially harmful. Windows includes native tools like Storage Sense, Disk Cleanup, DISM, and Device Manager that perform repairs safely without introducing bloatware or altering delicate registry entries.
How can I unlock a file that says "The action can't be completed because the file is open in another program"?
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Launch Resource Monitor (Win + R >
resmon), go to the CPU tab, expand Associated Handles, and type the name of the locked file into the search box. Resource Monitor will identify the exact process locking the file, allowing you to end the process safely. Read our Resource Monitor Handle Guide.
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