You'll need to make sure that your map has the same projection as your points.
If you created your points in ArcMAP you should be able to figure out which coordinate they are by examining their property within ArcMap or ArcCatalog.
Once you've figure that out, you can change the map projection within ArcExplorer.
In your application menu click "Map Properties" then "2D Coordinate System".
Thats where the coordinate systems are held.
Change your projection to the one which your points are and it will hopefully work.
Best of luck.
[ATTACH=CONFIG]13807[/ATTACH][ATTACH=CONFIG]13808[/ATTACH]