how do you use these photo effects in pse10? are these action(.atn) files?
Yes, they are .atn files.
Try deleting mediaDatabase.db3 to force it to rebuild. It keeps track of the contents of that panel, among other things.
In Windows 7 or Vista, go to C:\ProgramData\Adobe\Photoshop Elements\10.0\Locale\en_US (this path is different if you aren’t in the United States), and delete MediaDatabase.db3 to refresh the list of presets. In XP, it’s in C:\Documents and Settings\All Users\Application Data\Adobe\Photoshop Elements\10.0\ Locale\en_us (or your location).