Registration error 404

[Essentin]

Everything seemed fine till I decided to allow users to register. The problem is that when they click on REGISTER tab the .../register.php file is starting to load than after 2-3sec "error 404" appears. I really dont know that to do with this, I'm not good with PHP or MySQL so trying to find solution by myself ended as quick as it started. Register.php file is in proper place, main gallery folder. Adress for web is: http://taekwondo.awardspace.com/
Problem is quite urgent, please help 

[Nibbler]

Looks fine to me.

[Essentin]

Fine ? You mean you can register with no problem? Strange..

[Essentin]

No one knows how to fix it ? 

[phill104]

Work ok for me too. You may want to delete the account I just created called tester

[Essentin]

  now I'm totally confused.. looks like I need to check hosting settings than. Thanks for help anyway 

[Essentin]

Damn.. I've just noticed that the language file is most probably causing troubles. Everything is fine on ENG but PL is not working. Any idea what can be wrong ?

[Nibbler]

Did you modify the Polish lang file? If so upload a clean copy.

[Essentin]

No I didn't. Meaby file is corupted, i'll redownload it. Even when I changed lang file to look as close with form as ENG one didn't help.