Windows stopped with a DPC_WATCHDOG_VIOLATION (bug check 0x00000133) because the DPC watchdog timer detected that either a single Deferred Procedure Call (DPC) or Interrupt Service Routine (ISR) ran for longer than its allotted time, or that the system spent a prolonged period at IRQL DISPATCH_LEVEL or above. DPCs should complete within 100 microseconds; when a driver violates this, Windows forcibly stops to prevent a system hang.
A GPU driver (most commonly NVIDIA nvlddmkm.sys or AMD display driver) has a DPC routine that takes too long to execute, often triggered under graphics load.
A storage controller or SSD/NVMe firmware has a driver bug causing prolonged DPC execution.
A Bluetooth, audio, or network adapter driver is blocking DISPATCH_LEVEL execution.
A third-party security product (antivirus, anti-cheat software) is hooking deeply into the kernel and causing DPC contention.
CPU overheating causes the processor to throttle mid-DPC, extending execution time beyond the watchdog threshold.
Faulty or failing RAM causes the DPC routine to stall while waiting for memory operations to complete.
How to fix it
Identify the offending driver from the minidump: open C:\Windows\Minidump in WinDbg or upload to an online analyzer. The module named in the dump (e.g., nvlddmkm.sys, iaStorA.sys) points to the faulty driver.
Update or clean-reinstall GPU drivers using Display Driver Uninstaller (DDU) in Safe Mode, then install the latest driver from the GPU manufacturer's site.
Update storage controller, chipset, and motherboard drivers from the manufacturer's website — not just Windows Update.
Check CPU and GPU temperatures under load using HWiNFO64. Clean dust, reseat coolers, and reapply thermal paste if temperatures are excessive.
Run Windows Memory Diagnostic (mdsched.exe) or MemTest86 to rule out RAM as a contributing factor.
Run `sfc /scannow` and `DISM /Online /Cleanup-Image /RestoreHealth` in an elevated Command Prompt to repair corrupted system files.
Enable Driver Verifier (`verifier.exe`) targeting third-party drivers to force a more informative crash dump that identifies the exact offending driver. Disable after identifying the culprit.
If the crash occurs after a Windows Update, check Windows Update history and roll back the most recent update to test.
