Most notebook makers will send you a restore disk, though they often charge
for it. Check the site. Then, somewhere in the bowls of your new machine
is a program to make a recovery disk. It should be one of the first things
you do. Good luck.
If it still boots there is usually an option to restore to factory new using
that hidden partition. But you will lose anything you did since you bought
it. Try the manual, or the help files that came with it for information on
how to do it for your machine.
Good luck.