Error codes

0x00000001

APC_INDEX_MISMATCH

What it means

A driver left the kernel in an inconsistent state. Printer, audio and graphics drivers are common causes.

Common causes

• Printer, audio (Realtek) or graphics drivers
• A recent Windows update with a bad driver

How to fix it

1. Think about what changed just before it started (new driver, app, update or hardware) and undo that first. System Restore can roll back drivers without touching your files.
2. Open the crash dump in WhoCrashed or BlueScreenView: it usually names the driver file that caused it (for example nvlddmkm.sys is the NVIDIA driver).
3. Update the graphics, chipset and network drivers from the maker's site (NVIDIA, AMD, Intel or your board vendor), not from a driver-updater tool.
4. If it started after a Windows update, uninstall that update (Settings > Windows Update > Update history > Uninstall updates).