Question Error 404...

When I click in every category, topic or profile it gives me the error 404.
I've understand what's happening, I think.
Suppose I'm in "?/main/forum/home". Than I click on a topic: the link changes in "?/main/forum/welcome".
If I manually add "home" ("?/main/forum/home/welcome" it goes!
Canl you help me please?
I don't understand where is the problem.

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Legacy mode: Enabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

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Joomla default template details : PlayLords | author: Deflagration Lords | version: 1.1 | creationdate: 1.03.2009

Kunena default template details : Blue Eagle (default) | author: Kunena Team | version: 1.6.3 | creationdate: 2011-01-31

Kunena version detailled: Installed version: 1.6.3 | Build: 4344 | Version name: Parlare | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Forum PlayLords
board_offline	0
board_ofset	0.00
offline_message	<h2>Il forum è momentaneamente offline per manutenzione.</h2> <div>Ritornerà attivo al più presto!</div>
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Third-party components: AlphaUserPoints: Disabled or not installed | CommunityBuilder: Disabled or not installed | Jomsocial: Disabled or not installed | UddeIm: Disabled or not installed

Third-party SEF components: sh404sef: Disabled or not installed | ARTIO JoomSEF: Installed (Version : 3.2.10) | AceSEF: Disabled or not installed

Plugins: System - Mootools12: Disabled | System - Mootools Upgrade: Disabled | JFirePHP: Disabled or not installed | Kunena Discuss: Disabled or not installed | Kunena Search: Disabled or not installed | My Kunena Forum Menu: Disabled or not installed | My Kunena Forum Posts: Disabled or not installed

Modules: Kunena Latest: Disabled or not installed | Kunena Stats: Disabled or not installed | Kunena Login: Disabled or not installed

(1) Uninstall ARTIO JoomSEF.

(2) Disable the System - Legacy plugin

(3) Read Search Engine Optimisation (SEO) in the Wiki

Thank you, sozzled.
Disabling Legacy... This change what would affect my site?

All three things.

As far as legacy mode is concerned please read the very important information about continuing to use legacy mode . You can also use the results of this search to see what I think about using legacy mode. (I'm surprised I have only mentioned this message "please read the very important inforamtion about legacy mode" only 76 times before now! :blush: )

Ahah, I really really thank you!
I hope it will ok now.
Thank you again, tomorrow I'll check it. ^^

YEAH!
Now links are more.. horrible
Butt it works!
THANK YOU SOZZLED!
You saved me from desperation and frustration!
Kunena is a fantastic project, you're great, all of you!

P.S.= ARTIO now skip Kunena. Disinstalling it maybe was a little bit drastic!