Uninstall the trial version of Office that is currently installed
on your Dell PC, then use your genuine full version Office
2003 CD and the product key that came with it to install.
Uninstall the 2007 version using add/remove in Control Panel. Once removed
install the properly licensed version of 2003 that you have purchased from
another source.
There is no downgrade path (using a license from a newer product on an older
version) on OEM or retail versions of Office 2007/2003 like you can do with
Enterprise versions of the operating systems from Microsoft.
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