Or you could do a brand new install using unetbootin.
Assuming you are using 9.04
Code:
sudo apt-get install unetbootin
Download the 9.04 ubuntu iso from here
Launch unetbootin from applications > system tools (I think)
Unmount and unplug any usb storage device except for the one you want to use to install from.
Check the disk image spot halfway down and browse to your newly downloaded iso.
Just to be utterly sure type and check that the imformation in the output matches what is in the Drive box in the unetbootin gui (second from left at the bottom).
Click ok and wait for the magic.
Reboot and enter your bios (usually by pressing escape or one of the F buttons). Have a mess about in the menus till you find something about boot and change it to boot from usb.
Away you go.
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