try this!!

$NUL = Writevalue ("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Network","HideSharePwds","01000000","REG_BINARY")
$NUL = Writevalue ("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Network","DisablePwdCaching","00000001","REG_DWORD")