Welcome to the Community,
Install media works on a different system.
Since a different system may need different drivers (files) from the install media, the first step to troubleshoot is to burn another CD from the ISO image. If this does not work, please provide some details about the hardware on which you are trying to install ESXi.
André
PS: Branche from Installing ESXi - fatal error 6 (Buffer too small) to a new discussion to receive more attention