Hm, come to think of it, after reading Boboonski's post, I think I've had that before. I don't think it does anything bad to your computer, but I'm not entirely sure. You should probably get rid of it, better to be safe than sorry.

Text enhance is a program that automatically downloads itself onto your computer. If you have ads that say below it 'ads not by this site' that is text enhance doing its job. If you google it, you'll see they have a website. It doesn't tell you anything about it downloading itself. I'd get rid of it if I were you.