Unable to flash OS on cubieboard
Is the computer you are using LiveSuit/PhoenixSuit on 32 or 64 bit? If 32 bit the answer is simple, install the 3.drvinstaller_X86. If your PC is 64 bit you would install one of the x64 drivers. However, I am not sure if this will help you out in your particular case. A few other things to check:

Have you been able to turn on your device and start the stock android image? While we are at it do your LED lights turn on, ever? If So, when? Are you using the USB port as a file transfer port as well as trying to power the truck through the USB? A lot of people have had problems during livesuit and phoenixsuit upgrades by using the USB port as both. When powering the cubie truck with 5v 2A 4.0mm power supply the problem seemed to be resolved in most cases. Did you purchase your CT through IO? Check Device Issues with NAND operating system post on Cubie's website as there are two versions of board 3 (AllWinner A20 versions A and B). One is known to have compatibility issues.

Also to try having the power source plugged in to the wall during the upgrade/flash process.