ArcMap shows up incompatibility between versions

Hi there,
Cannot open map documents in ArcGIS Desktop 9.3 that were saved in ArcGIS Desktop 9.2? On the Internet I found that they are compatible with each other and it seems like I am the only one with this error. Does anyone have any solution ?
Thanks !

ArcMap
Opening the selected ArcMap document failed.
An unexpected error occurred while loading the map document.
Last Component: {5A350011-E371-11D1-AA82-00C04FA33A15}.
It may reference an extension that is not currently installed or one that failed to load.
The following extensions were present when the map was saved but are currently missing on your system:
-ESRI Animation
-Georeferencing
_TabletPC Support
-Tracking Environment
-Data interoperability
-Overposter Validaion
-ESRI Publisher Extension
-ESRI Route Hatching Extension
OK
