Le problème est caused by the Windows 7 updates.
Before using the Windows 10 Upgrade Assistant, perform these steps:
set Windows 7 updates to "Never install updates".
Stop the update service by right clicking on the invite de commandes, et choisissez "Run en tant qu'administrateur".
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Type
NET STOP WUAUSERV
It should say: "Windows update service is stopping....windows update service is stopped."
After completing the above steps, start the Windows 10 Upgrade assistant, and it should complete.