$User = "SERVER-NAME\AdminUser"
$Password = "Password"

$net = new-object -ComObject WScript.Network
$net.MapNetworkDrive("X:", "\\SERVER-NAME\TestFolder", $false, $User, $Password)
Copy-Item -Path "D:\Path\To\Copy\From" -Destination "x:\" -Recurse -Force -PassThru
$net.RemoveNetworkDrive("x:", 0)