After hours of desperate efforts I gave up.

As I cannost stop using IIS on my webserver I downloaded xampp and installed it on another virtual wxp machine (virtual machines are just cool, I love it

- of course if you have enough OS licences).
Everything works fine but it uses another public IP address which is something I don't like. But WB is really fine.
btw: the problems with IIS are in my opinion caused by unsufficent development from wb's side - drupal works with no problem with IIS (but I don't like it).
I understand the reason, I am not complaining, just commenting.
I just don't understand why it's webserver-related problem while php and mysql are working well.

I know, I am not alone