How to Decode Windows Error Codes: 0x80070005, 0xC000021A and More

Windows error codes like 0x80070005 or 0xC000021A follow a consistent structure. Once you understand the pattern, you can decode most errors without searching the internet.

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How Windows Error Codes Work

Take 0x80070005:

0x    8007    0005
│     │       │
│     │       └── Win32 error code (decimal 5 = ERROR_ACCESS_DENIED)
│     └────────── 8007 = HRESULT wrapping a Win32 code
└──────────────── 0x = hexadecimal prefix

Code families:

• 0x8007xxxx — Win32 API errors (most common)
• 0xC000xxxx — NT kernel errors (NTSTATUS, often in BSOD)
• 0x8000xxxx — COM/OLE errors
• 0x803Fxxxx — Microsoft Store errors

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Decode Errors in PowerShell

# Decode Win32 error code
[System.ComponentModel.Win32Exception]::new(5).Message
# Returns: "Access is denied"

# Decode from full hex code (extract Win32 part)
[System.ComponentModel.Win32Exception]::new(0x5).Message

# List common Win32 codes
@(2,3,5,14,32,112) | ForEach-Object {
  "$_ (0x{0:X4}) = $([System.ComponentModel.Win32Exception]::new($_).Message)" -f $_
}

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Common Error Codes Reference

Access and Permissions:

• 0x80070005 — ERROR_ACCESS_DENIED — run as administrator, check NTFS permissions
• 0x80070006 — ERROR_INVALID_HANDLE — restart the program or service

File System:

• 0x80070002 — ERROR_FILE_NOT_FOUND — file moved/deleted, run sfc /scannow
• 0x80070003 — ERROR_PATH_NOT_FOUND — folder doesn't exist
• 0x80070070 — ERROR_DISK_FULL — free up disk space

Network:

• 0x80072EFE — connection aborted — check internet connection
• 0x80072EE7 — DNS name not resolved — flush DNS, change DNS server

Windows Update:

• 0x80248007 — corrupted update database — clear SoftwareDistribution folder
• 0x80073712 — component store corrupted — run DISM RestoreHealth
• 0x80070057 — invalid parameter — run sfc /scannow

BSOD (NTSTATUS):

• 0xC000021A — system process terminated — safe mode, SFC, driver rollback
• 0x0000007E — system thread exception — driver issue, check Event Log

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Fix the Most Common Error: 0x80070005

# Option 1: Run as Administrator (simplest)
Start-Process powershell -Verb RunAs

# Option 2: Reset NTFS permissions on a folder
takeown /f "C:\ProblemFolder" /r /d y
icacls "C:\ProblemFolder" /grant Administrators:F /t

# Option 3: System file check
sfc /scannow

# Option 4: If Windows Update error
DISM /Online /Cleanup-Image /RestoreHealth

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Fix Windows Update Errors (0x80248007, 0x80070002)

# Clear update cache
Stop-Service wuauserv, bits -Force
Remove-Item "C:\Windows\SoftwareDistribution\*" -Recurse -Force -EA 0
Start-Service wuauserv, bits

# Repair Windows image
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

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🔍 Quick Lookup Tool

Instead of searching manually:

→ Windows Error Code Decoder — enter any code (0x80070005, plain decimal, or 8-digit hex) and instantly get the error name, common causes, and step-by-step fixes.

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Summary

0x8007xxxx = Win32 errors (most Windows errors). 0xC000xxxx = kernel errors (BSOD). Last four digits after 0x8007 = the specific Win32 code. Use [System.ComponentModel.Win32Exception]::new(code).Message in PowerShell to decode locally. For a complete lookup with fix instructions — use the Error Code Decoder.