# Removes all user directories except built-ins
$excludedSystemDirs = "Administrator", "Public"

$foldersToBeDeleted = Get-ChildItem C:\Users | Where { $_.Name -NotIn $excludedSystemDirs }

foreach($folder in $foldersToBeDeleted) {
    Write-Host "Removing folder '$($folder.FullName)'"

    cmd.exe /C rmdir /Q /S "$($folder.FullName)"
    if(-Not $?) {
        Write-Error "An error occured whilst removing $($folder.FullName)"
        exit 1
    }
}