Problem with Word 2007

[hapishyguy]

Hi All,

I am new to this site. I have a problem if someone can help me. I have MS Office preinstalled in my laptop. It was a trial version. Someone (one of my friends) were using my computer and he was playing with it. I do not what he did (i know something very stupid) but now everytime I start the Office it asks me to register. When I click on to register online it says that the key entered is not valid as it has been used many times. And now when I try to write soemthing in word it does not let me write anything. It says at the very bottom (status bar) on the left side that "The modification is not allowed because the selection is locked" Can someone please help me how to fix this. I am so annoyed by this. Please educate me.

Thanks