Perhaps now you know how to uninstall and reinstall it would be best to have a fresh start.
Make sure before uninstalling that all XAMPP components are stopped and any ticks in the Svc boxes in the XAMPP Control Panel (XCP) are removed, then close the XCP.
Finally remove completely your old xampp folder.
Instead of using the installer version of XAMPP this time, download the EXE (7zip)
Extract the files to the C:\
drive and they will be placed in C:\xampp
in their correct places.
Next run C:\xampp\xampp_setup.bat
to set the paths correctly.
Now before we do anything else you are best disabling IIS
as it will only cause you hassles as you have found out.
To disable IIS
go to your Windows Control Panel
and select Add or Remove Programs
Then in the left menu column select the icon Add/Remove Windows Components
A window opens with lots of item with tick boxes next to them.
Look for Internet Information Services (IIS)
and remove the tick in the box, then follow the prompts to remove it.
You may have to reboot here to get rid of everything that might be hanging about.
Now that is out of the way and your PC has restarted, go to your C:\xampp
folder and run xampp-portcheck.exe
and make sure all the ports are "free
Then open your XCP C:\xampp\xampp-control.exe
and start Apache
and make sure there are no ticks in the Svc
boxes and please note, do not
click on the Admin...
button next to MySQL or you may have more issues to contend with.
After you have the green running
indication for both Apache and MySQL it is time to go to http://localhost
and select your language and arrive at the XAMPP Welcome Page
From here you can check out the demos to make sure XAMPP is installed correctly.
You should also be able to go to phpMyAdmin from this page or go to http://localhost/phpmyadmin
in your browser.
Let me know back if all that works or if there is anything you don't understand or can't follow.