0x800700B7 ERROR_ALREADY_EXISTS (WU) — Windows Error Code

Q: What does the Windows error code 0x800700B7 mean?

It is the Win32 / NTSTATUS code ERROR_ALREADY_EXISTS (WU) (decimal -2147024713). Update file already exists. May indicate a partial previous download.

Q: How do I decode 0x800700B7 in PowerShell?

Run [ComponentModel.Win32Exception]::new(-2147024713).Message in any PowerShell session. For HRESULT-style codes, use err.exe from the Windows SDK or the WinDbg !error command.

Q: Where does Windows typically log this error?

It depends on the originating subsystem (Windows Update → %WinDir%\WindowsUpdate.log; AD/Kerberos → Security event log on the DC; BSOD → minidump under C:\Windows\Minidump; MSI → %TEMP%\msi*.log; WMI → Microsoft-Windows-WMI-Activity). Always cross-reference the timestamp and module name with the Application and System event logs.

Description

ERROR_ALREADY_EXISTS (WU) (hex code 0x800700B7, decimal -2147024713) is a Windows warning-level error code in the Windows Update & Feature Updates family. Microsoft surfaces this code through the Win32 API, the Common Language Runtime, the kernel, the event log, PowerShell, command-line tools (sfc, dism, gpupdate, sc), and Windows-side applications such as Outlook, Teams, Office, and System Center.

Update file already exists. May indicate a partial previous download.

This page documents what triggers 0x800700B7, the most common scenarios where it appears, the likely root causes, and a step-by-step troubleshooting workflow you can run against affected endpoints. It is intended for system administrators, MSP technicians, helpdesk engineers, and anyone diagnosing Windows behavior in a managed environment.

In-depth explanation

This is a warning-severity code. The operation did not necessarily fail; Windows may have completed it with side effects, conflicts, or a state that requires user attention. It is normally safe to retry, but should still be logged so repeated occurrences can be triaged.

It is part of the Windows Update / WUA error space and typically surfaces in the Settings app, WindowsUpdate.log, the CBS log, or in WSUS / Intune / Configuration Manager reports.

The code can be looked up programmatically in PowerShell with [ComponentModel.Win32Exception]::new(-2147024713).Message (for Win32 / NTSTATUS codes that map cleanly), or with net helpmsg <decimal> for the legacy decimal range. For HRESULT-style codes, decode the facility and code with err.exe from the SDK or via the WinDbg !error command.

Common causes

Corrupted Component-Based Servicing (CBS) store.
WSUS / Intune / SCCM serving the wrong update or a deprecated revision.
Insufficient free space on the system drive (Windows requires several GB free for feature updates).
Antivirus or EDR blocking wuauserv or the cbs.log writer.
Pending reboot from a previous installation locking the WinSxS store.

Troubleshooting steps

Run the official Windows Update Troubleshooter (Settings > System > Troubleshoot).

Stop the relevant services and reset the local cache:

net stop wuauserv bits cryptsvc msiserver
ren %SystemRoot%\SoftwareDistribution SoftwareDistribution.old
ren %SystemRoot%\System32\catroot2 catroot2.old
net start wuauserv bits cryptsvc msiserver

Repair the component store: DISM /Online /Cleanup-Image /RestoreHealth followed by sfc /scannow.
If a feature update fails, free up disk space (15+ GB on C:), unplug non-essential USB devices, and update or roll back the displaying drivers.
For domain-managed clients, verify GPO scoping, WSUS / Intune assignment, and check %WinDir%\WindowsUpdate.log (run Get-WindowsUpdateLog on Windows 10/11).

Decode in PowerShell

# Decode 0x800700B7 (-2147024713) in PowerShell
[ComponentModel.Win32Exception]::new(-2147024713).Message

# Or via WinDbg / err.exe (Windows SDK)
# err 0x800700B7

# Or net helpmsg (legacy decimal range only)
# net helpmsg <decimal>

Frequently asked questions

What does the Windows error code 0x800700B7 mean?

It is the Win32 / NTSTATUS code ERROR_ALREADY_EXISTS (WU) (decimal -2147024713). Update file already exists. May indicate a partial previous download.

How do I decode 0x800700B7 in PowerShell?

Run [ComponentModel.Win32Exception]::new(-2147024713).Message in any PowerShell session. For HRESULT-style codes, use err.exe from the Windows SDK or the WinDbg !error command.

Where does Windows typically log this error?

It depends on the originating subsystem (Windows Update → %WinDir%\WindowsUpdate.log; AD/Kerberos → Security event log on the DC; BSOD → minidump under C:\Windows\Minidump; MSI → %TEMP%\msi*.log; WMI → Microsoft-Windows-WMI-Activity). Always cross-reference the timestamp and module name with the Application and System event logs.

Is this code recoverable?

Yes — this code is informational or warning-level. The operation can normally be retried after addressing the condition described in the summary.

Should I open a Microsoft support case for this?

Open a case if the error reproduces after applying the troubleshooting steps, particularly if it blocks production workloads, occurs across multiple endpoints, or is associated with a security boundary (BitLocker recovery, Kerberos failure, DCOM hardening, SmartScreen / WDAC). Have a fresh CBS log, minidump, or Get-WinEvent export ready before opening the case.