complete “Begin your installation” and finale see
Fatal error: Class ‘Piwik_Session’ not found in /home/admin/domains/domain.com/public_html/piwik/index.php on line 45
whats wrong?
If you have eaccelerator, try disabling it.
eaccelerator not installed on server
Are you installing from our .zip? It should have a file named piwik/core/Session.php (that contains the Piwik_Session class).
yes
on ftp i see this file in correct dir.
2kb size
filename in lowcase
maybe its a problem?
lowcase my problem 
all work fine
Yes, all the filenames are case-sensitive.