Dell Vostro won't boot with a USB. When try to boot from it, it say "BOOT ERROR"

Question

Here's the problem; I'm trying to install Ubuntu:Maverick Meerkat using a USB flash drive on my dell vostro but when I try to boot from it, it say "BOOT ERROR". I used Universal-USB-Installer-1.8.0.8 to create the bootable USB flash drive. Any idea?

I tried the same process on other machines and it works fine.