When you restart your computer, there is usually something like a logo that pops up for just a couple seconds. While that logo is showing, keep tapping either F2 or delete. This should take you into BIOS. In BIOS, you go to the BOOT section by using your arrow keys then press enter. In the boot screen select boot device priority. Usually it is set up to boot first from floppy, second from CD, third from Hard disc. There are many different ways to follow this procedure depending on your computer. You may not be able to do this exactly as I say, but it should be close. DO NOT do anything else in the bios screen. Don't forget to save your changes if you make changes to your boot priority.