Diagerr.xml Setup Failure Analysis

Diagerr.xml Setup Failure Analysis | Generated by AI

Home 2026.07

Question: Analyze diagerr.xml from Windows Setup failure.

Answer:

I checked the screenshot. diagerr.xml confirms the same thing, but it does not contain the root cause.

The important entries are:

CUnattendManager::Initialize(90):
Result = 0x80070490

CMOSetupOneSettingsHelper::InitializeSettings(324):
Result = 0x80072EE7

CSetupHost::InitializeOneSettings(1606):
Result = 0x80072EE7

CSetupManager::OnFinishLaunchChoiceAction(8149):
Result = 0xC19001F4

Interpretation:

Code	Meaning	Importance
`0x80070490`	Element/not found	Secondary
`0x80072EE7`	Name resolution/network lookup failure	Secondary
`0xC19001F4`	Setup failure wrapper	Final result

diagerr.xml is basically a summary of the failure, not the detailed failure log.

The real error should be in:

C:\$WINDOWS.~BT\Sources\Panther\setuperr.log

or more importantly:

C:\$WINDOWS.~BT\Sources\Rollback\setupact.log

One clue from your screenshot:

Exe="X:\Sources\SetupHost.exe"

This is still running from WinPE (X:), and failure happens very early in SetupHost initialization.

So I now suspect:

Possibility 1: Unattend/settings issue (higher than before)

The log mentions:

CUnattendManager
CMOSetupOneSettingsHelper

Check if your USB contains:

\autounattend.xml

or:

\sources\PID.txt

Run:

dir D:\autounattend.xml
dir D:\sources\PID.txt

If present, remove them and retry.

Possibility 2: Windows ISO / USB creation issue

Because SetupHost cannot initialize settings correctly.

Check USB:

dir D:\sources

Expected:

boot.wim
install.wim

or:

install.swm
install2.swm

Possibility 3: Existing disk metadata

Still possible because of your earlier offline/unrecognized volume problem.

The clean install test:

diskpart

list disk

select disk 0

clean

convert gpt

exit

Then reinstall.

Next, please capture:

C:\$WINDOWS.~BT\Sources\Panther\setuperr.log

especially the top 30 lines.

diagerr.xml only tells us “Setup failed”; setuperr.log tells us “why”.

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