It is not clear from your post what the problem is so please clarify.

You are attempting to register your Sony 3d blu-ray disc player bdp-bx58. How are you attempting to do that, from the player itself or from a computer? If from the player itself have you tried registering at Sony's web site from a computer?

http://esupport.sony.com/ has a Registration option at the bottom of the page.

Also at the bottom of that page is Sony's Support options, eg;

Get Help
Support Forum
Chat Now
E-mail Us
Contact Us

Have you tried their "Chat Now" option?

Mark