Powershell:
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v BingSearchEnabled /t REG_DWORD /d 0 /f
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v CortanaConsent /t REG_DWORD /d 0 /f
Powershell:
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v BingSearchEnabled /t REG_DWORD /d 0 /f
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Search /v CortanaConsent /t REG_DWORD /d 0 /f
Yes No