Has anyone had any problems where a website behaves differently with Microsoft Internet Explorer 10? I got a call from someone who said that he could not use a drop-down window on a web page I manage after he upgraded to Internet Explorer 10 and he did not have any problems before.

If my memory serves me, it is not possible to have two versions of IE on a computer (which is what I would like to do to test this). Is that right?

Also, is it possible to uninstall and reinstall Internet Explorer?