can you see 验证码? if you can, there maybe some setting which is not compatible with 验证码 in your computer
i can get same problem when i log in freeoz in my school lab. but after several tries, i can make it.
it really beats me! i can't change IE setting in school lab so i have no experience.
but i think you'd better delete your IE cookies or use other browser such as firefox.
hope it's helpful.