Ilya,
that sounds like the watched folder may have changed and so the system is not watching the correct folder.
Please check the "Media Import Application" Launched from Start-Programs-Ross...
and ensure that the wat5chede folder is set to D:Media
The Media Import Wizard can also be used to drop all the media and rebuild the database form the file system. However, doing so will lose all IN/OUT Point settings and any buckets that have been created.
Todd