In the past, whenever you needed to reset the machine (computer) account password for a computer joined to an Active Directory domain, you could use netdom.exe to perform the task. While this no longer exists in Windows 10, you can also perform the task through Powershell:
Reset-ComputerMachinePassword -Server dc.domain.local -Credential (Get-Credential)
Replace dc.domain.local with the FQDN of a domain controller, or simply type the domain name (domain.local) to automatically select a domain controller. When running the cmdlet, you will also be prompted to enter the credentials of an account which is delegated to reset the computer account password of this particular machine.
If you are not interested in Windows 10, but are plagued with the icon and prompts to upgrade to Windows 10, you can get rid of this. The Windows 10 Upgrade comes with Windows Update in KB3035583. You can uninstall this update in order to remove the Windows 10 Upgrade.
Note that after removal, you will have to hide the update from Windows Update to prevent it from being installed again.