I d-loaded fedora 10 iso image i686. I mounted it and burned it`s content on a CD. In BIOS I put first boot-device to be cd-rom. When I restart PC it continues with normal boot. I have WinXP and Ubuntu8.10 with GRUB loader on my PC. I don`t want use ubuntu any more. I checked with ubuntu live cd it loads o.k. Maybe the trick is how to burn live cd.