Left:
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /t REG_DWORD /d 0 /f
Center:
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /t REG_DWORD /d 1 /f
Left:
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /t REG_DWORD /d 0 /f
REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /t REG_DWORD /d 1 /f