ErrorFindly
0x00000099BSODCritical

0x00000099 — Invalid Region or Segment | Blue Screen Fix Guide

INVALID_REGION_OR_SEGMENT

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000099 Mean?

A memory region or segment descriptor was found to be invalid.

Real-World Causes

  1. 1Memory corruption
  2. 2Driver corrupting memory descriptors
  3. 3Hardware memory failure

Symptoms

  • ⚠Blue screen with stop code INVALID_REGION_OR_SEGMENT
  • ⚠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 Windows Memory Diagnostic (mdsched.exe)
  3. 3Reseat RAM modules
  4. 4Check for Windows updates

Advanced Fix

For experienced users and IT professionals

  1. 1Test RAM with MemTest86 for multiple passes
  2. 2Analyze minidump with WinDbg
  3. 3Check for memory leaks using poolmon
  4. 4Inspect physical RAM slots and modules

Frequently Asked Questions

What causes INVALID_REGION_OR_SEGMENT?
A memory region or segment descriptor was found to be invalid.
Can I fix Invalid Region or Segment 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

0x0000001AMemory Management0x00000050Page Fault in Nonpaged Area

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.