Some concerns from someone that knows nothing about this 'Pando' thing.

Actaully Pando can be turned off the the System Startup services menu. It's a P2P client Nexon and other game developers use to have a BitTorrent-like download for the game as well as a download accelerator.

There's nothing wrong with it running or not running. It's just another invisible harmless service. My advice. Disable it after install. It is safe.