Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you have the disc for Office Professional 2003 then copy the contents on the disc to a flash drive (Pen drive) using another computer. Once the contents are copied try installing Office 2003 on the new laptop using the flash drive.
For Office 2003 licensing and terms, refer to the following link:
http://office.microsoft.com/en-us/products/HA102103671033.aspx