This may seem minor, but it's been bothering me intensely.

Usually when you highlight text with the cursor and type, the text is replaced. However, if I highlight text with the cursor and type, the highlighted text remains. Instead of replacing the text, the new text is tacked on the front of it.

This also means that I can't delete mass amounts of text with the Backspace key (the delete key still works, but that's not the conventional method). I have to backspace one character at a time.

Help?

P. S. If you have NO idea what I'm trying to say, I can always do some quick Print Screen and MS Paint work for you.