Profile creation error

Hello everyone.
I just installed dolphin 6.1 and I seem to have some issues with it.
I got it up and running, but when i tried to create a test profile, the registration went fine, but when i clicked on the view profile link "...com/test" i got 404 not found.

When I click on Blogs, i get the same error. Photos is the same, videos too.
Quite alot of the links simply dont work.

Can anyone help me with that ?

Thanks.

check to make sure your server has mod_rewrite enabled and if not either ask them to enable them or if they wont then you will have to disable the permalinks in the admin section.

Do I have to reinstall dolphin afterwards?

This is the reply i got from the admins at my hosting company:

In order for mod_rewrite to work on our servers, you must add RewriteBase / for your root directory and RewriteBase /subdir for subdirectory.

Well here is the start of my .htaccess file in the root directory:

AddType application/x-httpd-php5 .php
Options -MultiViews

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /
RewriteBase /subdir
RewriteRule ^articles/{0,1}$   articles.php [QSA,L]
RewriteRule ^ar............

This is what it looks like and it still doesnt work.
Some more help please?

By the way, i just disabled permalinks and the profiles work fine, but the Blogs, Videos, Classifieds, etc. dont.

Whats wrong?