System Interrupts is the most misunderstood entry in Task Manager. It’s not a program, not a service, and not something you can end — it’s a measurement. It represents the percentage of CPU time spent servicing hardware interrupts: the signals devices send when they need the processor’s attention. Every device does this constantly at low levels, which is why 0-2 percent is normal and healthy. But when System Interrupts sits at 10, 20, or 30 percent indefinitely, it means some piece of hardware (or its driver) is screaming for attention thousands of times per second — an interrupt storm.

This is fundamentally a hardware/driver problem, which makes it different from every other high-CPU issue. You can’t fix it by closing apps or disabling startup programs. The fix is detective work: identify which device is generating the storm, then update, roll back, or replace its driver — or in rarer cases, the device itself. The tools for this detective work are built into Windows, and this guide walks through them in order.

One reassuring note: interrupt storms are annoying and slow, but they rarely indicate imminent catastrophic failure. Most resolve with a driver update.

Why this happens

  • Buggy or outdated device drivers: The number one cause — a driver mishandling its device generates excessive interrupts.
  • Windows Update replaced a working driver: Updates sometimes install generic or problematic driver versions over manufacturer-tuned ones.
  • Failing storage drive: A dying HDD or SSD with read errors generates interrupt storms as the controller retries operations.
  • Faulty USB device: Bad USB drives, hubs, or peripherals can spam interrupts, especially during failed enumeration.
  • Network adapter issues: Wi-Fi and Ethernet drivers are frequent offenders, particularly after updates.
  • Misbehaving audio drivers: Audio devices with broken drivers generate high interrupt rates (often accompanied by audio glitches).
  • BIOS/firmware bugs: Firmware-level interrupt routing problems, sometimes fixed by BIOS updates.
  • Hardware conflicts: Rare on modern systems, but IRQ sharing issues can still occur with certain device combinations.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Confirm the measurement and check DPC latency

First, verify the problem is real and get a baseline. Task Manager’s number can be misleading on some systems.

  1. Open Task Manager and note the System Interrupts CPU percentage over 2-3 minutes.
  2. Download the free LatencyMon tool and run it for 5 minutes — it shows which drivers have the highest DPC (Deferred Procedure Call) counts.
  3. LatencyMon’s Drivers tab ranks drivers by execution time — the top entries are your prime suspects.
  4. Note the driver filenames (e.g., ndis.sys = network, storport.sys = storage, usbport.sys = USB).

This single tool often names the exact driver, saving enormous guesswork.

Fix 2: Update the suspect drivers

Once LatencyMon (or timing correlation) points at a driver category, update it properly.

  1. Open Device Manager and find the device category (Network adapters, Disk drives, Sound controllers, USB controllers).
  2. Right-click the device, choose Update driver > Search automatically — but don’t stop here, as Windows often says “best driver already installed.”
  3. Get the real driver from the manufacturer: Intel for Intel network/chipset, your laptop maker’s support page (Dell , HP ) for everything else.
  4. Restart and re-check System Interrupts.

Fix 3: Roll back a driver that just updated

If the spike started right after a Windows update, the update likely replaced your driver.

  1. In Device Manager, right-click the suspect device and choose Properties.
  2. Go to the Driver tab and click Roll Back Driver if available.
  3. Select a reason and confirm, then restart.
  4. If Roll Back is greyed out, manually install the older driver from the manufacturer’s support site.
  5. To prevent Windows from “updating” it again, use the Show or hide updates troubleshooter to block that driver update.

Fix 4: Disconnect USB devices one by one

USB devices are common interrupt storm sources and trivial to test.

  1. Unplug ALL USB devices (drives, hubs, receivers, printers, docks).
  2. Check System Interrupts — if it drops, a USB device is the cause.
  3. Reconnect devices one at a time, waiting 2 minutes after each, until the spike returns.
  4. Update or replace the offending device’s driver; if it’s a hub or dock, try a different port or hub.

Fix 5: Test network adapters

Network drivers are among the top LatencyMon offenders.

  1. In Device Manager, disable your Wi-Fi adapter temporarily (right-click > Disable device) and check interrupts. Use Ethernet or go offline briefly for the test.
  2. Then re-enable Wi-Fi and disable Ethernet, testing again.
  3. Whichever adapter correlates with the spike needs a driver update from the manufacturer (not Windows Update).
  4. Also try disabling adapter power-saving features: adapter Properties > Power Management > uncheck “Allow the computer to turn off this device.”

Fix 6: Check drive health

A failing drive generates interrupt storms through constant retry operations.

  1. Open an elevated Command Prompt and run chkdsk C: /f /r (schedule at restart if prompted).
  2. Check SMART data with a free tool like CrystalDiskInfo — look for reallocated sectors, pending sectors, or CRC errors.
  3. If the drive shows warnings, back up immediately — this is now a data-safety issue, not just performance.
  4. Update storage controller drivers (Intel RST, AMD chipset) from the manufacturer.

Fix 7: Update BIOS and disable problematic devices

The deep fixes for persistent interrupt storms.

  1. Check your manufacturer’s support page for BIOS updates — release notes sometimes mention interrupt or power management fixes.
  2. Update BIOS following instructions exactly (AC power, don’t interrupt).
  3. In Device Manager, you can disable devices you don’t use (e.g., an unused SD card reader or secondary network adapter) to eliminate them as suspects.
  4. As a last resort, a clean Windows install eliminates software causes entirely — if interrupts are still high on a fresh install with manufacturer drivers, it’s hardware.

For related driver-level CPU issues, see our guides for System Interrupts on Lenovo and on Dell systems. Microsoft’s Windows support documentation has additional driver troubleshooting resources.

Closing

System Interrupts high CPU is a hardware conversation, not a software-cleanup task: measure with LatencyMon, identify the spamming driver or device, and update or replace it. The detective work takes patience, but the fix is usually a single driver update — and your CPU goes back to spending its time on your work instead of fielding interrupt spam.

Frequently asked questions

What is the System Interrupts process?
System Interrupts isn’t a real process — it’s Task Manager’s way of showing CPU time spent handling hardware interrupts, which are signals from hardware devices needing the CPU’s attention. Normal values are under 1-2 percent. Sustained high values mean a hardware device or its driver is spamming the CPU with interrupt requests.
Can I end the System Interrupts task?
No — there’s nothing to end. System Interrupts is a reporting category, not a process you can kill. The fix is finding which hardware device or driver is generating the excessive interrupts and fixing that device or driver. Killing things at random won’t help and could destabilize the system.
Is high System Interrupts a sign of failing hardware?
Sometimes, but more often it’s a driver issue rather than dying hardware. Failing drives, bad USB devices, and dying network cards can cause interrupt storms, but outdated or corrupt drivers are the far more common cause. Always update your drivers first before suspecting hardware failure — that resolves most cases.
Why did System Interrupts spike after a Windows update?
Windows updates sometimes replace working drivers with generic or newer-but-buggy versions, particularly for storage controllers, network adapters, and USB controllers. If the spike started right after an update, rolling back the recently changed driver is the fastest fix.