With Core SEF it works with parameters:
Search Engine Friendly URLs = Yes
Use Apache mod_rewrite = No (but module is loaded in httpd.conf)
Add suffix to URLs = Yes

Set Use mod_rewrite to Yes to see if .htaccess file is set correctly. JoomSEF cannot work without mod_rewrite and .htaccess file.

Best regards,
ARTIO Support Team

With JoomSEF enabled and configured:
SEF URLs=Yes
mod_rewrite = Yes
Add suff=No
i'm back to my first post. ? replaced with %3f in "reffering page" link

No, disable JoomSEF. You need to get the standard Joomla's core SEO working with .htaccess first in order to JoomSEF work correctly. We cannot offer you a free help if we are not sure that this problem is JoomSEF related. I still think that the %3F is browser related - with .htaccess working, there shouldn't be the browser's 404 page at all, but the JoomSEF's one.

Best regards,
ARTIO Support Team

David, I'm terribly sorry.

Core SEF works with

Search Engine Friendly URLs = Yes
Use Apache mod_rewrite = Yes
Add suffix to URLs = Yes

and the %3f problem appears too here :-(

as i said above - it seems to me it's couldn't be browser problem because i use both Firefox and IE.

probably this is my httpd.conf and apache encode problem.

Thanks for your rapid help.