We had the same problem with version 4.0 in Windows Vista RC1 5600, the same exact error message. After installing (the programm ONLY runs with NO Xp Sp2 compatibility -!!!-) we successfully built the library and after importing 3-5 songs the programm stuck and we had to force quit it, on the next launch we got the error. Then, after restoring the vista (with windows restore) to the last point of the sonic installation (install SonicStage After Care tool) , it worked succesfully till we almost filled the device with 20Gb music, then while copying it stuck again and, failed to run again with the same error message. it seems that every time you have to force quit the programm it vorrupts some database files. You will not loose the library scan after the restore though. We will try to restore manually the whole Sony folder in programm files (from a manual copy) to see if this works. good luck