I'm not sure what softokn3.dll is, but you don't need the pando media booster. That installed when I installed D&D online, but I removed the pando media booster later. It's not needed.
Well, I'm no expert on pando, but as I said, I was able to uninstall it and play my mmo fine without it. maplestory has their own forums and someone has already posted your exact same error. Keep an eye on it and hopefully you will both be fixed. Sorry I can't be of more help.