[SLE] Problem with installation of Suse Linux 10.1 64bit

Does anyone install the 64bit Suse Linux 10.1 release? I have downloaded all the n.5 iso images and burned on my CDs but during the installation from CD1 of "linux32_1.0_349.x86_64.rpm (10.65Kbyte)" the following error appeared: "the package has not been found on the media" If I click on details the following sentence appear: "Err:3: Package Isof-4.76-11 fails integrity check. Do you want to retry downloading it or abort installation?" I have downloaded again the iso CD1 file and burned it on CD. But the problem occurs again and in the same point. All the n.5 CD have been checked during installation and no problem raised on checksum. Flavio