Change Local Admin Password

Alright,  I am beating my brains in over here.  I am trying to query AD for a list of computers based on OS Type and change the passwords accordingly.  I can query AD and find all of the computers, but when I try to use it in the array, it uses the Distinguished Name instead of the Name Field.

$OSList = Get-ADComputer -Filter {OperatingSystem -Like '*Windows*'} -Properties OperatingSystem | Select Name,OperatingSystem
foreach ($OS in $OSList) {
  if ($OS.OperatingSystem -like 'Windows Server*')
  {
     ([ADSI]"WinNT://$($OS.Name)/Admin").SetPassword('NewPassword')
  }
  if ($OS.OperatingSystem -like 'Windows 7*')
  {
     ([ADSI]"WinNT://$($OS.Name)/Admin").SetPassword('NewPassword')
  }
  Write-Host "Changing Admin Password on $OS.Name"
}

I keep getting the error "The Network Path was not found", because it is reading $OS as the Distinguished Name.  I am sure I just have my variables mixed up somehow.  Any help would be greatly appreciated.

Respectfully,

Chris Priester