Error codes

0x000000C2

BAD_POOL_CALLER

What it means

A driver made a wrong request to the kernel's shared memory pool.

Common causes

• Antivirus, VPN or old network drivers
• Faulty RAM

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. Uninstall third-party antivirus and VPN software to test.
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. Test the RAM: run Windows Memory Diagnostic (search mdsched) or MemTest86 from a USB stick. Any error means a stick or its speed setting is the problem.