Hi claire,
The conventional wisdom is that you need to unistall the trial version before installing the retail product. Any data & customizations you've created should be retained, however.
As for the installation media, you can copy it to a USB thumb-drive (eg using another computer) or attach an external DVD drive and install from there, or you could download the installation files direct to the netbook and install without the need to access an external drive.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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