Changing fonts make program crash?

I type some text and then want to change the font to some other font and the program crashes.

I have tried two ways. I click on the text and then go up to the font bar and scroll down to the font I want to use, but before I even get a chance to scroll much the program crashes. The second way is I highlight the text I want to change, and again go up to the font bar and start to scroll down to the font I want, and the program again crashes and closes.

Any suggestions what the problem could be? I use Windows XP.