0x000000D4 is a driver and device stop code result. This indicates that a driver did not cancel pending operations before unloading.
Code reference and safe checks
Read the exact screen and operation before selecting a repair. This page does not run commands or collect files, keys or logs.
What this value means
This indicates that a driver did not cancel pending operations before unloading.
SYSTEM_SCAN_AT_RAISED_IRQL_CAUGHT_IMPROPER_DRIVER_UNLOAD identifies a stop-code family. The four bug-check parameters and dump, if available, help distinguish the actual failure path.
| Code | 0x000000D4 |
|---|---|
| Short hex form | 0xD4 |
| Symbol | SYSTEM_SCAN_AT_RAISED_IRQL_CAUGHT_IMPROPER_DRIVER_UNLOAD |
| Windows family | Blue screen and stop codes |
| Source level | Microsoft bug-check page |
Microsoft’s technical cause notes add: This driver failed to cancel lookaside lists, DPCs, worker threads, or other such items before unload. Subsequently, the system attempted to access the driver's former location at a raised IRQL.
The linked debugger page also describes its parameters: If the driver responsible for the error can be identified, its name is printed on the blue screen and stored in memory at the location (PUNICODE_STRING) KiBugCheckDriver .
Safe next steps
- For 0x000000D4 (SYSTEM_SCAN_AT_RAISED_IRQL_CAUGHT_IMPROPER_DRIVER_UNLOAD), record the stop code, four parameters if available, and the driver file shown on screen or in the dump.
- If Windows starts, compare recently changed drivers with the exact PC or device maker’s support page. Use Safe Mode only if normal startup fails.
- A named module may be where Windows stopped, not the proven root cause. Avoid broad driver removal.
After one step, repeat the original operation and record whether this same code returns. A different code needs a fresh interpretation.
What this code cannot prove
The source establishes the identifier and reference meaning. It does not establish the cause on your specific PC.
If Windows no longer starts or the issue repeats with hardware warnings, protect files and use manufacturer or qualified support.
Official reference and verification
Source type: Microsoft bug-check page. Checked against the source set on Nov 2, 2026.
The reference gives the meaning of this identifier. It does not inspect your PC or guarantee that one repair will work.