Insert the OS installation media (DVD, USB), go to BIOS, set the number 1 boot priority to dvd/usb, follow the installation wizard (there's also the option to format the drive during the setup wizard) and all you need to do afterwards is wait.
Insert the OS installation media (DVD, USB), go to BIOS, set the number 1 boot priority to dvd/usb, follow the installation wizard (there's also the option to format the drive during the setup wizard) and all you need to do afterwards is wait.
Some laptops come with a recovery partition to automatically load the operating system, other's you have to use a Windows install disk. What model laptop do you have?