please.

I have Joomla 1.0.15 installed and joomsef 2.3.0. Before joomsef i had sh400sef.

I installed by documentation. Rewrite htaccess.txt to .htacces and copied new content.

Turned on seo option in global settings.

The component doesn't work. In the beckend I can't change (save,cencel, edit) the new settings and I am reaciving error

"Bad Request
Your browser sent a request that this server could not understand."

Sef urls are created but they do not work. I am also reaciving this error.

What is wrong?