WordPress MU

Hy,
1°:
sorry for my terrible english :)

2°
I try to install WP MU and when I try to oper login page it hasn't grafics and the follw is broken:
http://itinerari.xprit.eu/wp-admin/css/login.css/?ver=20090514

If I try to remove /:
http://itinerari.xprit.eu/wp-admin/css/login.css?ver=20090514

I can see the file.

3°
if I try to login the following page is: Error 404 - Not Found

I had some other site with "wordpress" on same server and I haven't problem ...

:( ---

Why are you using those URLS? there shouldn't be anything after the wp-admin. If you go to your base URL with wp-admin on the end it brings up a login box with no style associated with it.

I modified nothing ...
I install it and the next step is click login link ...