First of all, let us try to uninstall any XAMPP installation you have. After that, reboot the system. Make sure that there no Apache instances before you use the installer again. Could you also make sure that you have nothing listening in port 80? Try entering http://localhost:80 in your browser. If everything is ok, you should see a "Connection Refused" error.
After that, try installing again but make sure you are using Administrator Privileges. Please let us know if you see any errors in the installation.
Javier J. Salmerón
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