pb buttons won't work

the right arrow key on my power book (also the "end" key) won't let me scroll to the right anymore. Here's what's odd, though. It works for things like when you hold down the shift and use it to highlight, or control and hit it to skip to the end of the line, option and hit it to skip words, etc. So why won't hitting it by itself make it move forward one letter?

 

haha

Long story short, my girlfriend used the computer and made the right arrow key speak highlighted text, that's why it didn't work by itself. Thanks for the help, though.