If you're looking for a portable version of Microsoft Office 2003, you may want to explore options like:
Because this software is over 20 years old and the "portable" format is unofficial, there are significant drawbacks: Software Review: Microsoft Office Professional 2003
Microsoft never designed Office 2003 to run portably from a USB drive without installation. Third-party repacks found on torrent sites or file-sharing platforms are illegal and dangerous.
Microsoft Office 2003 remains a sought-after piece of legacy software for users who prefer its classic interface and low system requirements. While there is no official "portable" version of Office 2003 released by Microsoft , third-party portable versions are often used to run the suite from a USB drive without a standard installation. Overview of Microsoft Office 2003