I ran \xampp\xampp-portcheck.exe and port 443 was being used by uTorrent and 80 was free.
Then I opened the XAMPP control panel, and saw that there were 5 modules: Apache, MySQL, TomCat, FileZilla and Mercury and none of them have been started.
I started MySQL and Apache, but Apache would stop by itself automatically as soon as I started it. So now I have MySQL running and I tried http://localhost
and it's still not working.
Thank you so much for your time