When you restart you computer, you should be able to press a button which will come up with a HP menu that will do all this for you when you ask it to.
Reboot the PC, and check for a piece of text somewhere saying how to get to HP Setup or something. It should be there. For example, try pressing the Del key at bootup.
(this is used for going to the bios, but HP can replace it for there recovery program, and bios can be another key instead)
If that does go to bios, then check again for text at bootup.
If you can't see it as it goes too fast, try pressing the Pause/Break button on your keyboard, as this can be used to slow menus down or even pause them until you press it again to find the information you want.
After you have found it, press the button and itshould have a HP menu saying stuff like 'Recover' and a suite to test your PC for errors and everything
I hope this helps