I opened a webpage on internet and I wanted to add a memberships system with a database to keep important informations for my and my customers' safety.

To create a memberships system, as far as I learned, it is necessary to have mysql app installed on the computer and phpmyadmin.

As a Win10 User, I've opened Internet Information Services, I can reach to 127.0.0.1 and localhost. In 127.0.0.1 and localhost, there is a blue Windows Internet Information Services screen.

I installed Xampp for phpmyadmin.

When I enter things like 127.0.0.1/Xfolder to the address bar, I can see everything inside the X folder, but when I enter 127.0.0.1/phpmyadmin to the address bar, I can't see anything but annoying http errors.

I thought that there might be a problem with the Xampp I downloaded and I tested a different Xampp, AppServ, Wampserver etc. Again, I came across with HTTP errors with different codes likes HTTP ERROR 404, 404.3 404.17, 500, 500.19...)

Current error example:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the configuration data for the page is invalid.

Detailed Error Information:
Module: IIS Web Core
Notification: BeginRequest
Handler: Not yet determined
Error Code: 0x80070003
Configuration Error: Unable to read configuration file
Configuration File: \\?\C:\inetpub\wwwroot\phpmyadmin\web.config
Requested URL: http://localhost:80/phpmyadmin/
Physical Path: C:\inetpub\wwwroot\phpmyadmin\
Login Method: Not yet determined
Login User: Not yet determined

Configuration Source:
    -1:
     0:

More information:
This error occurs when the Web server or Web application has a problem reading the configuration file. In some cases, the event logs may contain more information about what is causing this error.
Show more info »

What may cause this problem? How can I reach to myphpadmin?

Thanks from now on to everyone who will try to help.