Apache won't start adter mysql purge

[TimSch]

Hello
yesterday I had some problems with mysql. I found a hint in another forum to remove mysql.
I didn't thought about dependencies and so it seems that I accidently removed Plesk.
But that's not the only problem. The main problem is that Apache won't start.
I already tried to use the autoinstaller but I still can't find the /usr/local/psa directory.

The error:

/etc/init.d/apache2 restart
* Restarting web server apache2                                                                                                                     [fail]
* The apache2 configtest failed.
Output of config test was:
apache2: Syntax error on line 216 of /etc/apache2/apache2.conf: 
Syntax error on line 6 of /etc/apache2/conf-enabled/zz010_psa_httpd.conf: 
Syntax error on line 12 of /etc/apache2/plesk.conf.d/horde.conf: Could not open config directory /etc/apache2/plesk.conf.d/webmails/horde: No such file or directory
Action 'configtest' failed.
The Apache error log may have more information.

The apache error.log doesn't contain informations.
Can anybody help me?

Thank you
Tim