I don';t hinik that you mean "reboot" because "booting" (From the technical term: "bootstrap loader".) happens every time you switch the PC on.
If you mean you want to reload the Operating System (Windows? You don't say.), some models of PC have a recovery partition on the hard disk but others require a "Recovery Disk". It depends on the model of the PC and you don't say what you have.
BTW its LAPTOP.
T, January 2011
