The stupid questions here are one's that have nothing to do with computers (how to grow bigger radishes, will there be a full moon on Monday.. etc.).
Your question concerns XP 32 bit compatability for the Radeon 5450, a good question.
The AMD site indicates it comes with:
So it will work on 32 bit XP. If it only had 64 bit drivers, it would have said drivers for Windows XP X64.The AMD page showing this is at:http://www.amd.com/US/PRODUCTS/NOTEBOOK/GRAPHICS/ATI-MOBILITY-HD-5400/Pages/hd-5450-specs.aspx
Certified drivers for Windows 7, Windows Vista, and Windows XP