For the most up-to-date experience, some users install the "Unofficial SP4," which bundles all post-SP3 updates released until 2019. Microsoft Community Hub Critical Security Warning
For 90% of users, the Volume License SP3 ISO is the "top" choice due to activation freedom. For those installing on a Core 2 Duo or Pentium 4 machine, the official MSDN ISO is best. windows xp professional 32bit iso top
To confirm you have successfully installed the 32-bit Professional version rather than the 64-bit or Home editions, HP Support suggests: Right-click and select Properties . Report: Windows XP Professional 32-bit ISO For the