SUGGESTIONS:
1) (most likely) Norton Internet Security is blocking
your validation from running, so the form gets stuck
waiting for approval. It is recommended that you either
add www.hhdonline.com to the "safe" sites list or
disable the software.
2) It could be some vague over limit issue. Is you're
maxing out every field of the system (probably not), but
if so, try filling in just the minimum required fields
and see if the problem is still there.
3) IE 6 (highly unlikely, since almost every one is
currently using it), but if that may be a problem, then
you could upgrade to IE 7
http://www.microsoft.com/windows/ie/default.mspx