Plug your i Atkos USB drive into a USB 2.0 port on your computer (USB 3.0 doesn't always work), or insert your i Atkos DVD into your DVD drive. If things go well, your computer will boot into i Atkos instead of booting from your normal hard disk. If you do not manage to reach the i Atkos menu, check your motherboard's BIOS settings to make sure that the changes you made in Step 3 were properly applied.