I was in trouble again.

A difficult problem happens to me one after another. As you know, I could not open my CD at our presentation class. After class I went to the computer room, and tried to open it again. To my amazement, it worked well. I asked the expert ( Both he and she are very kind.) in the computer room how to open it in our classroom. I was fool. As I used the windows 2007, I should have changed it to 2003 version. I did not know that at all. Ignorance is not bliss,but danger for me.