Form not working in IE9

The form works perfect in Chrome and Firefox but gets hung up at different stages in the submission process, anywhere from 25% to 82% complete, a few times it made it to submit but then would not submit.

I have done the following to check for conflicts:
1. Disabled all plugins (they are still disabled)
2. Tested on Twenty Twelve, Twenty Eleven and Twenty Ten themes, the same problem appeared.
3. I have disabled Output HTML5 in the settings panel.

http://thewebtamer.com/lets-get-started-client-worksheet/

Please advise.
Thanks for your help.

I don't know. hmmm, this is frustrating. I'll have to look at it later this evening. Thanks for the quick reply.

I just tried to fill in the form and used the exact same fields that you used and it kept stopping at 50%. My client is having problems also. I cleared the browser cache in between tests but I'm not having the same success as you. All of the plugins are still disabled so that's not the problem. What do I do at this point? It is not working for me or my client in another state using IE9.

I need to reactivate the plugins, need to work on my website some but need this fixed too!