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0x000000C7BSODCritical

0x000000C7 — Timer or DPC Invalid | Blue Screen Fix Guide

TIMER_OR_DPC_INVALID

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x000000C7 Mean?

A timer or DPC (Deferred Procedure Call) object was found in an invalid state, indicating memory corruption.

Real-World Causes

  1. 1Memory corruption affecting timer/DPC objects
  2. 2Driver bug corrupting kernel objects
  3. 3RAM failure

Symptoms

  • ⚠Blue screen with stop code TIMER_OR_DPC_INVALID
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Run System File Checker (sfc /scannow)
  3. 3Check Windows Update
  4. 4Run DISM /Online /Cleanup-Image /RestoreHealth

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump with WinDbg
  2. 2Check Event Viewer for correlated errors
  3. 3Use Process Monitor to trace system activity
  4. 4Perform clean boot to isolate the cause

Frequently Asked Questions

What causes TIMER_OR_DPC_INVALID?
A timer or DPC (Deferred Procedure Call) object was found in an invalid state, indicating memory corruption.
Can I fix Timer or DPC Invalid myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x000000B8Attempted Switch from DPC0x00000019Bad Pool Header

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.