Search sites like Amazon or eBay for physical installation media (CDs) or unused product keys .
A free, open-source alternative that provides excellent compatibility with Excel files and runs smoothly on legacy hardware . How to Get Office 2010 for Windows XP
Microsoft Excel 2011 was developed exclusively for and cannot be installed directly on Windows XP . For users on the Windows XP platform, the most advanced compatible version is Microsoft Office 2010 .
Below is a guide on how to handle spreadsheet needs for Windows XP today. Compatible Alternatives for Windows XP
If you already have Office 2003 , you can download the Microsoft Office Compatibility Pack to open, edit, and save files created in newer versions of Excel . Why You Can't Use Excel 2011
Another stable choice for XP, offering full compatibility with the newer .xlsx file formats .