If you are very new to OS installation (any OS, windows,linux).. , disk partitions etc, better do not install it yourself. I also assumed that you have brand new laptop which do not contain any important data because deleting, re sizing disk partitions can result in loss of data.
The reason why I did not want you to prepare live USB from Ubuntu 9.04 is because Ubuntu 9.04 use legacy GRUB and from Ubuntu 9.10, Ubuntu started using GRUB2. All versions of Ubuntu 9.10 and above use GRUB2. This should not be problem why your live USB which is created from Ubuntu 9.04 USB disk creator is not working, but it can be. I am not sure.
The best option for you is create live USB from http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
from other PC which has windows. But again if you are very new to OS installations, disk partitions etc, I suggest better get help from someone. If it is hardware problem, then you get help from Dell because your laptop should be in warranty period.