Windows Error Code Lookup

Every code below is covered by at least one of our free guides. Type the code from your blue screen, Windows Update, or error dialog to jump straight to the fix. On a blue screen, photograph the stop code before the PC restarts — or recover it from Event Viewer.

32 codes covered by our guides

Blue screen stop codes (20)

CodeFix guideAlso covered in
BAD_POOL_HEADERHow to Fix BAD_POOL_HEADER in Windows 11

A driver corrupted Windows’ kernel memory pool, commonly a security suite or bad RAM.

BAD_SYSTEM_CONFIG_INFOHow to Fix BAD_SYSTEM_CONFIG_INFO in Windows 11
CLOCK_WATCHDOG_TIMEOUTHow to Fix CLOCK_WATCHDOG_TIMEOUT in Windows 11

A CPU core stopped responding — often an unstable overclock or a driver fault.

CRITICAL_PROCESS_DIEDHow to Fix CRITICAL_PROCESS_DIED in Windows 11

A process Windows cannot run without stopped, commonly from corrupt system files.

DPC_WATCHDOG_VIOLATIONHow to Fix DPC_WATCHDOG_VIOLATION in Windows 11

A device or driver took too long to respond — often an old SSD firmware or driver.

DRIVER_POWER_STATE_FAILUREHow to Fix DRIVER_POWER_STATE_FAILURE in Windows 11
INACCESSIBLE_BOOT_DEVICEHow to Fix INACCESSIBLE_BOOT_DEVICE in Windows 11

Windows cannot reach the drive it boots from — often after an update or BIOS change.

IRQL_NOT_LESS_OR_EQUALHow to Fix IRQL_NOT_LESS_OR_EQUAL in Windows 11

A driver tried to access memory it should not — usually a bad or outdated driver.

KERNEL_DATA_INPAGE_ERRORHow to Fix KERNEL_DATA_INPAGE_ERROR in Windows 11

Windows could not read data back from the drive — often an early sign of disk failure.

KERNEL_SECURITY_CHECK_FAILUREHow to Fix KERNEL_SECURITY_CHECK_FAILURE in Windows 11

Windows detected corrupted data in the kernel, usually a driver or memory issue.

KMODE_EXCEPTION_NOT_HANDLEDHow to Fix KMODE_EXCEPTION_NOT_HANDLED in Windows 11

A kernel-mode program failed, often tied to fast startup or a recently changed driver.

MEMORY_MANAGEMENTHow to Fix the MEMORY_MANAGEMENT Blue Screen Error

Windows found a fault handling memory, often a RAM stick or a driver at fault.

NTFS_FILE_SYSTEMHow to Fix NTFS_FILE_SYSTEM BSOD in Windows 11

The drive’s file system is damaged, from bad sectors or an unsafe shutdown.

PAGE_FAULT_IN_NONPAGED_AREAHow to Fix PAGE_FAULT_IN_NONPAGED_AREA in Windows 11
PFN_LIST_CORRUPTHow to Fix PFN_LIST_CORRUPT in Windows 11

Windows’ index of physical memory pages was damaged — usually failing RAM.

SYSTEM_SERVICE_EXCEPTIONHow to Fix SYSTEM_SERVICE_EXCEPTION in Windows 11
SYSTEM_THREAD_EXCEPTION_NOT_HANDLEDFix SYSTEM_THREAD_EXCEPTION_NOT_HANDLED in Windows 11

A driver hit an error nothing caught — the failing .sys file is usually named on screen.

UNEXPECTED_STORE_EXCEPTIONFix UNEXPECTED_STORE_EXCEPTION in Windows 11

A core Windows component crashed, commonly tied to storage or antivirus software.

VIDEO_TDR_FAILUREHow to Fix VIDEO_TDR_FAILURE (nvlddmkm.sys) in Windows 11
WHEA_UNCORRECTABLE_ERRORHow to Fix WHEA_UNCORRECTABLE_ERROR in Windows 11

A physical component reported a fault that could not be fixed — genuine hardware.

Windows error codes (10)

CodeFix guideAlso covered in
0x80004005How to Fix Error 0x80004005 in Windows 11

A generic failure with no detail — the cause depends entirely on where it appeared.

0x80070002How to Fix Common Windows 11 Update Errors
0x80070003How to Fix Common Windows 11 Update Errors
0x80070005How to Fix Error 0x80070005 (Access Denied) in Windows 11

Windows Update, the Store, or activation was refused access it needs to a file or key.

0x80070570Fix Error 0x80070570: File or Directory Is Corrupted

Data read back did not match what the file system expected — failing storage or bad media.

0x80073712How to Fix Common Windows 11 Update Errors
0x800F081FHow to Fix DISM Error 0x800f081f in Windows 11

DISM could not find the replacement files it needs to repair Windows.

0x800F0922How to Fix Common Windows 11 Update Errors
0x80370102How to Install WSL on Windows 11 (and Fix It When It Fails)
0xC0000142How to Fix Application Error 0xc0000142 in Windows 11

An app failed to start correctly, usually from missing runtimes or corrupt files.

Browser errors (2)

CodeFix guideAlso covered in
DNS_PROBE_FINISHED_NO_INTERNETHow to Fix DNS_PROBE_FINISHED_NO_INTERNET in Chrome

The browser cannot resolve website addresses — a DNS rather than a hardware fault.

ERR_CONNECTION_TIMED_OUTHow to Fix ERR_CONNECTION_TIMED_OUT in Windows 11

Not listed? Most codes have a sibling with the same fix. General blue screen guide · General Windows Update errors guide · All guides