** This issue has been addressed at ArcGIS version 9.3.1. **
Strange characters are displayed in the Data Interoperability connection dialog boxes on some Windows XP Service Pack 2 (SP2) and Service Pack 3 (SP3) computers.
This issue has been addressed 9.3.1.
This is a known issue due to using the Windows Classic theme.
Some testing results have shown that it may be possible to switch back to the previous modified theme after changing it to the Windows XP theme.