I tried many things and found that the XAMPP Control Panel v18.104.22.168.1.0 software and the Microsoft ISS services are both part of the problem. Try the following and it should works (select section A or B)
Section A- If you already installed XAMPP,try this first before anything else:
1: Close XAMPP Control Panel v22.214.171.124.1.0
2: Go to "C:\xampp\apache\bin" (C:\xampp\is the default installation directory).
3: Start Apache directly without the control panel by clicking on the httpd.exe file.
4: Now to test if its working, go to your internet browser and open the url "http://localhost/". If its working, you should see the XAMPP Welcome page. If its not working, then uninstall completely XAMPP and go to Section B.
Section B- XAMPP is not installed yet or is uninstalled.
First thing to do is to shutdown Microsoft - ISS services.
1: Open Control Panel by clicking the Start button, then clicking Control Panel.
2: Select control panel view classic.
3: Click on Programs and Features;
4: Select Turn Windows features on or off
5: Uncheck the Internet Information Services box then press OK (on the picture it is checked). Dont worry, you could re activate it later if you got any problems.
6: Install XAMPP. Again, Apache will not work if you try to start it with the XAMPP Control Panel v126.96.36.199.1.0 software. Because has i said, theXAMPP Control Panel is also part of the problem. But now, you should be able to start Apache directly.
7: Go to "C:\xampp\apache\bin" (C:\xampp\is the default installation directory).
8: Start Apache directly without the control panel by clicking on the httpd.exe file.
9: Now go to your internet browser and open the the url "http://localhost/". You hould see the Welcome XAMPP page.