System Interrupts High CPU in Windows 11? Find the Bad Driver and Fix It
In Task Manager you see a process called System interrupts using a steady 10%, 30%, even 100% of the CPU — and ending it isn’t an option.
Why: “System interrupts” isn’t a program — it’s how Windows reports the CPU time spent handling hardware interrupts from your devices. When it’s high, a piece of hardware (or its driver) is firing far more interrupts than it should. The usual culprits are network adapters, audio drivers, and USB controllers with a buggy or outdated driver. The good news: it’s almost always fixable by updating or rolling back one driver — no hardware replacement needed.
Fix 1: Isolate the device causing it (start here)
You need to know which device is to blame before you fix a driver. Disable hardware one at a time and watch whether System interrupts drops.
- Right-click Start and open Device Manager.
- Test the common offenders in this order, disabling one, watching Task Manager for a few seconds, then re-enabling if it didn’t help:
- Network adapters (Wi-Fi and Ethernet) — right-click → Disable device.
- Sound, video and game controllers (audio, especially Realtek) — same.
- Universal Serial Bus controllers and any external USB devices — unplug USB devices one at a time.
- When CPU usage drops the moment you disable a device, you’ve found the one with the bad driver. Re-enable it and move to Fix 2.
(Don’t permanently leave your network or audio disabled — this step is only to identify the culprit.)
Fix 2: Update the problem device’s driver
A fresh driver fixes the majority of System interrupts cases.
- In Device Manager, right-click the device you identified and choose Update driver.
- Select Search automatically for drivers and let Windows install what it finds.
- For network, audio, and graphics, also grab the latest driver straight from the PC, motherboard, or component maker’s site — those are often newer than what Windows offers. Install it and reboot.
Fix 3: Roll back if it started after an update
If the high CPU began right after a Windows or driver update, the new driver is likely the problem — go back to the version that worked.
- In Device Manager, right-click the device → Properties.
- Open the Driver tab and click Roll Back Driver.
- Pick a reason, confirm, and restart.
If Roll Back Driver is greyed out (no previous version stored), instead right-click the device → Uninstall device, reboot, and let Windows reinstall a clean copy — or install the older driver from the maker’s site manually.
Fix 4: Rule out a one-off glitch and update firmware
- Restart the PC. A stuck device sometimes clears on a clean reboot before you do anything else.
- Update BIOS/UEFI and chipset drivers from your PC or motherboard maker — these govern how interrupts are routed and a stale version can cause exactly this.
FAQ
Can I just end the System interrupts process? No — it’s a system process with no End task option. You stop the high usage by fixing the device behind it, not by killing the meter that measures it.
Is System interrupts a virus? No, it’s a legitimate part of Windows. Persistently high usage points to a driver or failing piece of hardware, not malware.
It’s still high after updating every driver. A failing device (a dying disk, a flaky USB controller, or a port) can flood interrupts. If software fixes don’t help, test by removing external devices and, if it persists, have the hardware checked.
Sources: Microsoft Support — Update drivers through Device Manager in Windows, Microsoft Support — Tips to improve PC performance in Windows