Set-AutoLogon.ps1

# Set-AutLogon.ps1
# This script does the following:
# - Force logoff all users.
# - Edits AutoLogon registry keys with specified input.
# - Restarts the computer.
#
# The supplied password is stored in plain text within the Registry; however,
# this value is delete once the specified number of logons has occurred.
#
# Tested with PowerShell 4.0 on Windows 7 Enterprise.

    Param(
        [parameter(Mandatory=$true)]
        [String[]]
        $ComputerID,

        [parameter(Mandatory=$true)]
        [String]
        $Username,

        [parameter(Mandatory=$true)]
        [String]
        $Password,

        [parameter(Mandatory=$false)]
        [Int]
        $TimesToLogin = 1
    )

    $credentials = Get-Credential

    ForEach ($computer in $ComputerID) {

        Invoke-Command -ComputerName $computer -Credential $credentials -ScriptBlock {
            Param($Times, $User, $Pass)

            $shutdown = $env:SystemRoot + "\System32\shutdown.exe"
            Start-Process -FilePath $shutdown -ArgumentList '-l -f' -Wait

            $path = 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon'
            Set-ItemProperty -Path $path -Name AutoAdminLogon -Value 1
            Set-ItemProperty -Path $path -Name DefaultUserName -Value $User

            try {
                if (-Not (Get-ItemProperty -Path $path | Select-Object -ExpandProperty "DefaultPassword" -ErrorAction SilentlyContinue )) {
                    New-ItemProperty -Path $path -Name DefaultPassword -Value $Pass
                }

            } catch {
                New-ItemProperty -Path $path -Name DefaultPassword -Value $Pass
            }

            Set-ItemProperty -Path $path -Name DefaultPassword -Value $Pass

            try {
                if (-Not (Get-ItemProperty -Path $path | Select-Object -ExpandProperty "AutoLogonCount" -ErrorAction SilentlyContinue )) {
                    New-ItemProperty -Path $path -Name AutoLogonCount -Value $Times
                }

            } catch {
                New-ItemProperty -Path $path -Name AutoLogonCount -Value $Times
            }

            Set-ItemProperty -Path $path -Name AutoLogonCount -Value $Times

            Restart-Computer -Force

        } -ArgumentList $TimesToLogin,$Username,$Password
    }

# Examples:
# Specify a single Hostname or IP address. This example will AutoLogon 1 time with the specified account.
# ./Set-AutoLogon.ps1 -ComputerID 10.20.20.105 -Username "Domain\Username" -Password "myPassword" -TimesToLogin 1
#
# Specify a range of either Hostnames or IP address by importing from a CSV file.
# The '.Hosts' listed below references the column heading in the CSV file.
# ./Set-AutoLogon.ps1 -ComputerID $( (Import-Csv -Path "C:\hosts.csv").Hosts ) -Username "Domain\Username" -Password "myPassword"