You'll have to uninstall the Home & Student trial first.
You can copy the installation files of Office Enterprise to a large enough
USB key (stick, dongle, thumb drive, or whatever they call it in your
country ;-)) and install from there. Copying the installation files from or
directly installing via a network share will work as well.

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more

http://www.msoutlook.info/
Real World Questions, Real World Answers

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"KayH21" wrote in message
...
I have got the full version of Office Enterprise but the home & Student
trial
is pre-installed on my notebook - I tried just entering the produce key
but
obviously this didn't work. I have no CD rom (as it is a niotebook) do I
need to buy an external CD rom drive or is there a way I can just override
it somehow with the product key?