The obvious questions is why are you installing 9.10 and not the latest
version. Ubuntu 9.10 was a bad release for many people. Graphics and sound
problems were the chief culprits. Ubuntu 10.04 is free. All it costs is the
time to download it. You don't even need to burn a CD if you have a usb key
and your computer can boot from usb (most newer ones can).

It is your choice, but why install a six month old problematic release when
you have a new LTS release?