change DNS script, can't make it update description variables

My environment is a static IP one and I must change the DNS settings on all the WinXP and Win7 clients. I pretty much have the gist of the script down except maybe part of the loops.  The first loop just checks to see if the PC is accessible, then runs thru a text file with all the hosts and should output the hostname and the NIC description for each. The problem is that the $nic.description is always the same for each machine even though there are several different NICs in use here. Most of them are Intel(R) 82579LM but I know that most of the laptops should come back saying Inter(R) Centrino(R) - but EVERYTHING is saying 82579 so i'm not convinced this is working right. My text file only has 3 PCs and 1 laptop in it while I test this, before I commit the command to all 2000 machines get false positives.

$servers = get-content c:\pc.txt
$nics = get-wmiobject win32_networkadapterconfiguration | where-object {$_.DHCPEnabled -eq $False -and $_.IPAddress -gt 1}
$newDNS = "10.100.67.137","10.100.67.224"
foreach($server in $servers)
{
if (Test-Connection -ComputerName $server -Count 1 -quiet)
 {
   Write-Host ""
   Write-Host "Connecting to $server..."
   foreach($nic in $nics)
   {
      Write-Host "`tExisting DNS Servers on" $server $nic.description "was" $nic.DNSServerSearchOrder
      $x = $nic.SetDNSServerSearchOrder($newDNS)
      if($x.ReturnValue -eq 0)
      {
         Write-Host "`tSuccess! Changed DNS on" $server $nic.description "now" $newDNS
      }
      else
      {
         Write-Host "`tFailed to change DNS on" $server
      }
   }
 }
 else
 {
    write-host ""
    write-host "Failed to connect to " $server
 }
}