Fix ERROR_INVALID_LDT_OFFSET (0X00000233) in 3 steps

What this error means (and why it's rare)

I've seen this error maybe a dozen times in my help desk days. The Local Descriptor Table (LDT) is an old-school memory structure that modern Windows mostly ignores. When you see 0X00000233, it's almost always a specific program—often an older game, a custom tool, or a piece of industrial software—trying to use a memory offset that doesn't exist.

The real trigger? Usually a corrupted process memory table, a bad driver, or antivirus scanning that interferes with the program's memory access. I've also seen it after a Windows update that changed memory handling. Don't panic—this isn't hardware failure.

Fix 1: Reboot and restart the program (30 seconds)

I know this sounds too simple. But I can't count the times a reboot cleared a transient LDT mapping issue. When Windows restarts, it rebuilds memory tables fresh. If the error popped up after a sleep/resume cycle, this is almost certainly your fix.

1. Save your work and close all programs.
2. Click Start > Power > Restart—not Shut Down. On Windows 10/11 with fast startup, a full shutdown doesn't reset kernel memory. A restart does.
3. After reboot, launch the program that crashed.

If it runs fine, you're done. If not, move to the next step.

Fix 2: Check for driver or antivirus conflicts (5 minutes)

This error loves to show up when a driver or security software corrupts the LDT offset. I've pinned it on Norton, McAfee, and even Windows Defender's real-time scanning in rare cases.

1. Temporarily disable your antivirus real-time protection. On Windows Defender, go to Virus & threat protection > Manage settings and turn off Real-time protection.
2. Try running the program again. If it works, add the program's folder to your antivirus exclusions.
3. Open Device Manager (right-click Start > Device Manager). Look for devices with yellow exclamation marks—especially graphics drivers, network adapters, or chipset drivers. Update those.
4. If you recently installed a driver, roll it back: right-click the device > Properties > Driver > Roll Back Driver.

Still crashing? Let's go deeper.

Fix 3: Registry edit to disable LDT usage (15+ minutes, advanced)

This is the nuclear option. Windows normally doesn't let programs create their own LDT entries, but some legacy apps or custom tools try. You can force the kernel to reject those calls entirely.

1. Press Win + R, type regedit, hit Enter.
2. Navigate to:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

3. Right-click in the right pane, select New > DWORD (32-bit) Value.
4. Name it DisableLDT.
5. Double-click it, set Value data to 1, choose Hexadecimal, click OK.
6. Close Regedit and restart your PC.

After reboot, try the program again. This flag tells Windows to return an error to any program that tries to create or modify an LDT entry. Since almost nothing uses LDTs anymore, you won't break anything modern.

If the program still throws the error after this, the issue isn't the LDT—it's something else in the program's memory map. In that case, I'd recommend using Process Monitor from Microsoft Sysinternals to trace the exact call that fails. Filter by the program's name and look for LDT or Invalid offset entries.

When to give up and use compatibility mode

Some ancient software just refuses to play nice with modern Windows. Right-click the program's executable, go to Properties > Compatibility, and try Windows 7 or even Windows XP SP3 mode. Check Disable fullscreen optimizations too—I've seen that fix memory mapping errors on older games.

If nothing works, you might need to run the software in a virtual machine with an older OS. Windows XP Mode (free from Microsoft) has saved my bacon more than once for industrial control software.

Final thoughts

ERROR_INVALID_LDT_OFFSET is a throwback to Windows' 16-bit roots. It's frustrating because it's so rare, but the fix is usually simple. Start with the reboot, fight the antivirus, and only break out the registry if you have to. You'll be fine.