How to use ubuntu amd64 bit on intel 64 bit processor?

[wentworthmiller5]

Hello.

I want to use ubuntu on my laptop.
I downloaded amd64 version, and when I install it, the ubuntu say " Error "prefix" is not set. Error, couldn't read file.".
What can I do?

The ubuntu 10.04 x64 work great, but 10.10, 11.10, 12.04 not... I want to use 12.04...
Intel® Dual Core™ B950 2.1GHz
Anybody help??? I have 8 GB RAM, so needed use x64 bit operating system.
Sorry my english....

[wentworthmiller5]

The problem solved.

You must turn off the UEFI boot in BIOS.