我重新又download了office professional 2007, 有了新的product key number, 可还是不能type, or click anywhere other than "open", it does look like the trial version hass expired, but I just re-downloaded the trial version again, I don't know why it's still not working. On the left bottom of the word application, it says “This modifications is not allowed because the selection is locked.” I googled it and found a lot of people have the same problem, but it seems the only solution is to buy the full version. 这里有哪位电脑高手能解决这个问题吗？Other than buying the full version, 我差钱. 多谢了.