You do not need to re-install ArcGIS 9.3 Service Pack 1. NOTE: If you've installed ArcGIS 9.3 Service Pack 1 prior to November 24, 2008, simply install ArcGIS 9.3 SP1 (Desktop, Engine, Server) Topology Validation Patch to fix this issue. Please see Technical Article 35833 for more information. Some of the ArcGIS 9.3 Service Pack 1 setups have been replaced to address the following additional fix: Important Notes ArcGIS 9.3 Service Pack 1
Installing this Service Pack on UNIX/Linux.Installing this Service Pack on Windows.
Issues Addressed with this Service Pack.