Error running the Official TOEFL® ibt sample questions

[Paihan]

Hi, I'm a new arrival here. (xD)
I know that it's impolite to post a question without searching before, but I got no time.
(I mean, since my aunt will call me at any moment, I can't keep using the computer for a long time.)

Before I took the iBT test this month, I downloaded the sample questions from the ETS official site.
It's supposed to have more than 5 samples in each section(L, R, S, W), but the problem is that I can't use the other parts beside the first ones in each part.

For example, if I've just finished the reading section, the system will probably ask me to get the next example of the test, but it just gave me a error message.
And, the system was giving me a message of "Unable to execute user code function. This file may be damaged." But as long as I kept clicking the continue, I can finish the first examples of all the section.

And after that, I will receive a error and keep doing the same example again and again.

Currently, I'm running the program under a Traditional Chinese Windows XP.
I've tried to get myself an APPLocale and set it to run in English mode, but it didn't solve the problem.

Someone also got this stupid problem?

I got no other way to practice for the iBT before the 1/10's test, and got a 71 pts xD
(She is angry with that.)