Symptoms
- Fans run loud and constant
- Programs freeze or respond slowly
- Task Manager CPU column pinned near 100%
- Laptop gets hot even when mostly idle
Likely causes
- CommonA single misbehaving app or browser tabPoorly coded software or a stuck script can loop and consume a full core.
- CommonOutdated or corrupt driver, especially graphics or chipsetBad drivers can cause background services to spin needlessly.
- PossibleMalware or a cryptomining infectionHidden processes use CPU constantly, often under a disguised name.
- PossibleWindows Update or antivirus doing scheduled workTemporary but can look identical to a stuck process.
- PossibleToo many browser tabs or extensionsEach tab is its own process that adds up quickly.
What to do
- Open Task Manager (Ctrl+Shift+Esc) and sort the Processes tab by CPU.
- Note the top process; if you don't recognize it, search its exact name online before ending it.
- Right-click the offending process and choose End Task if it's safe to close (avoid ending core Windows processes you don't recognize).
- Restart the PC to see if the usage returns to normal after a clean boot.
- Update graphics, chipset, and other drivers from Windows Update or the manufacturer's site.
- Run a full malware scan with Windows Security or a reputable second-opinion scanner.
- Reduce open browser tabs and disable unused extensions.
- If a specific Windows service (like svchost.exe) is the cause, use Task Manager's 'Go to details' or Resource Monitor to identify which service inside it is responsible.
Tools and parts
- Resource Monitor (built into Windows)
When to call a pro
If usage stays maxed with no identifiable cause after a scan and driver updates, a technician can check for hardware faults or deeper malware.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.