Change default background in Windows 7 default profile

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REG.EXE LOAD HKU\TempDefaultUser "C:\Users\Default\ntuser.dat"

REG.EXE ADD "HKU\TempDefaultUser\Software\Policies\Microsoft\Windows\Personalization" /v ThemeFile /d "C:\Windows\Resources\Themes\aero.theme" /f

REG.EXE UNLOAD HKU\TempDefaultUser