Sony MSAC-US30 Operating Instructions Manual page 71

On System Restore and Windows XP/Windows Me
When using the Windows XP or Windows Me, executing the "System
Restore" item in System Tools may make it impossible to play back the
songs managed by "SonicStage."
Therefore, be sure to back up the song data managed by "SonicStage"
before you execute "System Restore."
After "System Restore" has been executed, the backed-up data can be
restored and the songs managed by "SonicStage" can then be played
back again.
For how to back up data, see the Help information for "SonicStage."
PNote
An error dialog appears if playback of song data is impeded following
execution of "System Restore." In this case, follow the instructions displayed
on the screen.
10-GB