This error occurs when attempting to load a point theme or do anything that would require using a marker from the marker set:
Assertion "status == 1"
failed at line 149 of file "..\sym\ntfont.c"
The marker palette is empty or your ESRI fonts are corrupt.
There are 9 fonts installed with ArcView GIS.
If this is not resolve the problem, you may need to install a set of ESRI fonts from another machine.