Roses

So, here's the situation. I recently got a Ti-89 Titanium, and i was trying to put some games on it. I had it plugged into my computer, and i sent Phoenix, Tetris, and Falldown over to it. Going through Var-Link and selecting the program didnt seem to work, so i decided to try downloading an OS. the OS i downloaded was DoorsOS. I sent the OS over to the calculator, and it still didnt work. After a couple tries, i got "DoorsOS" to appear on the line, and i hit enter. This froze up my calculator, leaving a busy icon in the lower right, and an "Address Error" at the top. Removing batteries and putting them back in doesnt seem to work. What can i do?

Additional Information: pressing second and the green key seems to work, but i cant get any other buttons to register. Removing batteries is the only way to shut it down, and when i put it back in again it just continues the freeze error.