Changing Local User password remotely with Powershell - powershell

Question

I'm trying to work with this code that I found. It says it is changing the password to the account I specify, but when I try to log into that laptop with that local account password was not changed.
I need to be able to change the password to the local user account remotely to 30 + laptops without logging into each of them to do so.
Any ideas why this is not working?
$erroractionpreference = "SilentlyContinue"
$a = New-Object -comobject Excel.Application
$a.visible = $True
$b = $a.Workbooks.Add()
$c = $b.Worksheets.Item(1)
$c.Cells.Item(1,1) = "Machine Name"
$c.Cells.Item(1,2) = "Password Changed"
$c.Cells.Item(1,3) = "Report Time Stamp"
$d = $c.UsedRange
$d.Interior.ColorIndex = 19
$d.Font.ColorIndex = 11
$d.Font.Bold = $True
$intRow = 2
foreach ($strComputer in get-content C:\MachineList.Txt)
{
$c.Cells.Item($intRow,1) = $strComputer.ToUpper()
# Using .NET method to ping test the servers – This is very cool!
$ping = new-object System.Net.NetworkInformation.Ping
$Reply = $ping.send($strComputer)
if($Reply.status -eq "success")
{
# This is the Key Part
$admin=[adsi]("WinNT://" + $strComputer + "/LocalUser, user")
$admin.psbase.invoke("SetPassword", "Password")
$admin.psbase.CommitChanges()
$pwage = $admin.passwordage
If($pwage.value -ne "0")
{
$c.Cells.Item($intRow,2).Interior.ColorIndex = 4
$c.Cells.Item($intRow,2) = "Yes"
}
Else
{
$c.Cells.Item($intRow,2).Interior.ColorIndex = 3
$c.Cells.Item($intRow,2) = "No"
}
}
Else
{
$c.Cells.Item($intRow,2).Interior.ColorIndex = 3
$c.Cells.Item($intRow,2) = "Not Pingable"
}
$c.Cells.Item($intRow,3) = Get-Date
$Reply = ""
$pwage = ""
$intRow = $intRow + 1
}
$d.EntireColumn.AutoFit()