Error codes

0x000000C7

TIMER_OR_DPC_INVALID

What it means

A driver queued a timer or a deferred call with data the kernel rejects, so the scheduler stopped the machine.

Common causes

• An outdated audio, network or chipset driver
• A driver from a virtual machine or emulator tool
• A BIOS with broken timer settings

How to fix it

1. 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).
2. 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.
3. Remove virtualisation and emulator drivers you no longer use, then retest.