[horde] 404 Not Found for the login file ?????? (not for the menu)

[Eric Piollet]

1) When i go to http://myserver/horde/
    I've the menu (with horde & imp icons)
    but in the middle of my page i have 404 Not Found for the link :
    http://myserver/horde/imp/?Horde=291bfaf212c521859a10fa2f4d18ce2f&Horde=291bfaf212c521859a10fa2f4d18ce2f

2) When i go to http://myserver/horde/imp/login.php and after put my auth :
    I have 404 Not Found for the link : 
http://myserver/horde/imp/redirect.php?Horde=88c20cd6d31651221aed0510fd6b1028


RedHat 6.2
Horde 2.1
IMP 3.1
PHP 4.2.1
And imap, mysql ...
I've installed horde in /usr/local/apache/htdocs/horde
all the config was made 
I want to use imp auth for horde

What is my error ??? -> httpd.conf?,registry.php?, horde.php?, servers.php? a bad install ?? 
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