WAMP wordpress windows 2012 R2 hang step 2 (9 replies)

Hello (posted this as well i wordpress forum. it is urgent. sorry),
i know this problem was discussed multiple times but none
of the suggested solutions solved the issue for me:

I followed all steps precisely and when i call

[localhost]

in browser and fill
in:

db:mywebsite
user:root
pw: (leave blank)
server: localhost:8080
pref.: wp_

There is an endless loading time, sooner or later the
browser screen is getting blank.

I run wamp on port 8080.
Also created database 'mywebiste'
webserver is running, green and port test is successfull.

php-ini has this entry:
max_execution_time = 120

Wamp server is 64bit version latest.
Filename:
wampserver3.0.4_x64_apache2.4.18_mysql5.7.11_php5.6.19-7.0.4.exe

The logs does not contain usefull information.
last entry in access.log:
[08/Aug/2016:08:59:50 +0200] "POST /mywebsite/wp-admin/setup-config.php?step=2 HTTP/1.1" 200

When i delete the database in phpmyadmin i get exactly the same
behaviour. (So it seems database not found)
When i change
server: localhost:8080
to
server: localhost:80
i get immediately an error about cant find server

The wamp is installed in c:\wamp64

Any idea what could be wrong ?
Thank you