How to Fix High CPU Usage From System Interrupts

High CPU usage from System interrupts is usually caused by a faulty device, driver, firmware problem, or failing hardware—not by an application you can close. Restart Windows, disconnect recent peripherals, and update or roll back the drivers for USB, audio, networking, storage, and the chipset; then test the PC under the same workload that caused the slowdown.

Is System interrupts really causing the high CPU usage?

System interrupts appears in Task Manager as a process-like entry, but it measures processor time used to handle hardware interrupts and deferred procedure calls. It should normally use little CPU while the computer is idle. A short increase while you connect a device, start audio playback, transfer files, or wake the system is normal and does not by itself indicate a fault.

Open Task Manager with Ctrl + Shift + Esc, select Processes, and click the CPU column to sort it. Leave the computer idle for several minutes, then repeat the check while performing the activity that causes the slowdown. Look for System interrupts staying high, repeated spikes that coincide with stuttering, or high usage that continues after the hardware activity stops.

System interrupts uses unusually high CPU and the PC becomes slow, hot, noisy, or stuttery.

Do not diagnose the problem from one reading. Check the Performance tab for total CPU usage and compare it with the System interrupts entry. If another process is consuming the CPU, System interrupts may only be a brief side effect. LatencyMon can help identify interrupt or driver latency, but it is not required for the first round of isolation.

Which PCs and devices are most likely to have this problem?

This problem can start after a Windows update, a manufacturer driver update, a BIOS change, or the connection of a new peripheral. System interrupts is usually the symptom, not the root cause. Common causes include:

• A damaged USB device, cable, hub, dock, webcam, controller, or Bluetooth accessory.
• An audio driver or audio enhancement that causes repeated interrupts.
• A Wi-Fi, Ethernet, Bluetooth, or VPN-related driver problem.
• A storage device, controller, cable, or firmware fault.
• An outdated or incompatible motherboard chipset driver or BIOS.
• Failing memory, a motherboard component, a power supply, or another hardware device.

This procedure applies to supported Windows 10 and Windows 11 PCs, including desktops and laptops. You need an Administrator account for driver changes, BIOS updates, and some diagnostic tools. Several tests require a restart. Back up important files before BIOS, storage, or firmware work. Do not begin by changing firmware settings or formatting a drive.

Before changing anything, disconnect recently added hardware if that is safe, record which activity triggers the issue, and check whether a normal restart clears it. If you use a dock, test the computer without it. Keep the keyboard, mouse, display, and network connection you need, but remove nonessential equipment.

How to find and fix the device or driver causing it

Work from the least disruptive checks toward selective isolation. After each change, retest instead of changing several unrelated drivers at once.

1. Restart Windows normally. A restart clears temporary driver state and shows whether the problem is one-time or repeatable. If System interrupts returns to normal and stays there, monitor the PC. If it returns immediately, continue.
2. Install pending Windows updates, then obtain current chipset, BIOS, USB, audio, network, storage, and Bluetooth drivers from the PC or motherboard manufacturer. Use the manufacturer’s model-specific support page when possible. Do not install a BIOS intended for a different model.

Settings > Windows Update > Check for updates

Install one related group of updates at a time and restart when requested. If the problem began immediately after an update, use the manufacturer’s older driver or Windows’ rollback option rather than adding random driver packages.

3. Shut down the PC and unplug nonessential USB devices, external drives, hubs, docks, controllers, webcams, and Bluetooth receivers. On a laptop, turn off or disconnect accessories that are not needed. Start Windows and check Task Manager. If the load disappears, reconnect devices one at a time until it returns. Replace the offending cable, hub, or device, and test a different USB port.
4. Test the main device groups. For audio, switch temporarily between the built-in output, a USB headset, and another available output. For networking, test Ethernet instead of Wi-Fi or Wi-Fi instead of Ethernet. Disconnect external storage and card readers, then check whether file access or disk activity triggers the problem. If the fault follows one device or connection, that is stronger evidence than a generic driver warning.
5. Use Device Manager to inspect suspected hardware. Look for a warning icon and check Properties > General for a device status message. Record the device name and driver version before changing it.

Right-click Start > Device Manager > device category > device > Properties > Driver

Choose Update driver only when you have a suitable package or Windows Update source. If the issue started after a driver change, use Roll Back Driver when available. Otherwise uninstall the device from Device Manager and restart so Windows can detect it again. Save the manufacturer’s driver package first, especially for network hardware.

Do not disable System interrupts itself. Disable only one suspected physical device at a time, and only temporarily, so you can test whether it is responsible. Do not disable storage controllers, display adapters, or network hardware if you cannot restore access or have no alternate input or connection.

6. To isolate a built-in device, right-click the suspected device in Device Manager and choose Disable device, then retest. Start with Bluetooth, a secondary audio device, an unused network adapter, or a nonessential controller. If CPU usage drops, re-enable the device and install its correct driver or leave it disconnected until it can be repaired. If disabling it changes nothing, re-enable it before testing the next device.
7. For a clean driver reinstall, download the correct package from the manufacturer, disconnect from the internet if Windows would automatically reinstall the problematic version, and use Device Manager’s Uninstall device option. Select removal of the driver package only when the manufacturer’s replacement is ready, then restart and install that package. The expected result is normal idle CPU usage and no repeatable stutter. If nothing changes, the driver may not be the cause, or the hardware may be failing.

How to confirm the fix worked

Retest under the same conditions that exposed the problem. First restart Windows, wait until startup activity has settled, and leave the PC idle for several minutes. Then repeat the activity that previously caused the CPU load, such as playing audio, joining a call, copying files, using Wi-Fi, or connecting the dock.

Check Task Manager over several minutes rather than relying on a single reading. System interrupts should no longer remain unusually high, and total CPU usage should fall when the triggering activity stops. The PC should also return to normal behavior: temperatures should stop climbing at idle, fans should become quieter, audio and video should stop crackling or stuttering, and keyboard or mouse input should feel responsive.

If you use a hardware-monitoring program, compare temperatures with the same workload before and after the change. If you use LatencyMon, let it run during the activity that caused trouble and look for a clear reduction in reported interrupt or driver latency. Tools differ in how they report results, so judge the outcome with real-world symptoms and Task Manager together.

The fix is credible when the problem stays absent after multiple restarts and after reconnecting the devices you kept. If high usage returns only when one device is connected, that device, its cable, its port, or its driver remains the leading suspect.

What to do if System interrupts stays high

If the issue remains after peripheral isolation and driver work, check the parts that can generate repeated hardware errors. Back up important files first, then check storage health with the drive manufacturer’s diagnostic utility or the PC maker’s hardware diagnostics. Run Windows Memory Diagnostic or the system manufacturer’s memory test, and review the results after restarting.

Settings > System > Recovery > Advanced startup > Restart now > Troubleshoot > Advanced options > Startup Settings

Safe Mode loads a limited set of drivers. If the problem disappears there, a third-party driver or service is more likely. A clean boot can narrow that further by starting Windows with non-Microsoft services and startup programs disabled; re-enable items in groups until the fault returns. If the problem began after a Windows or driver update, uninstall that recent update or use System Restore when an appropriate restore point exists.

A BIOS or chipset update may resolve an interrupt problem, but follow the manufacturer’s instructions exactly, keep the computer on reliable power, and do not interrupt the process. If storage errors, memory errors, crashes, burning smells, unexplained disconnects, or high usage across multiple operating systems appear, stop stressing the system and arrange hardware service.

Never disable System interrupts, randomly edit the registry, or use registry cleaners as a fix. Those actions do not repair the device generating the interrupts and can create a second problem. If no device or driver can be isolated, provide a technician with the PC model, recent changes, diagnostic results, and the exact conditions that reproduce the fault.

Conclusion

Restart first, then isolate recent peripherals and test USB, audio, network, and storage devices one at a time. If the issue survives targeted driver work, use the storage, memory, Safe Mode, and manufacturer diagnostics described above and arrange hardware service when those checks point to a failing component.

Frequently Asked Questions

Can I end System interrupts in Task Manager?

No. It is not an ordinary application, and ending or disabling it is not a valid repair. Find the device or driver generating the interrupts instead.

Does high System interrupts always mean the CPU is failing?

No. USB devices, audio and network drivers, storage faults, firmware, and other hardware can all cause it. A failing CPU is not the usual first suspect.

Why does System interrupts spike briefly when I connect a device?

Windows must handle the device’s hardware requests, so a short spike during connection or activity is normal. It becomes a problem when usage stays high or causes repeatable heat, noise, latency, or stuttering.