Please do post the link here to get the best support, or send the link to email@example.com and be sure to include a link to this topic so I know what we're talking about. Thank you.
Couple other things to check right off the bat though. Be sure to check for plugin and theme conflicts by following these instructions http://rkt.gs/testing
Also, try turning of AJAX and see if the form works in IE8.
Finally, does this form work in the Form Preview when using IE8?