function common_ProcessBeforeDataMove()
    STRING svLogFile;
    NUMBER nResult;
 begin

  InstallationInfo( @COMPANY_NAME, @PRODUCT_NAME, @PRODUCT_VERSION, @PRODUCT_KEY );

  svLogFile = UNINST_LOGFILE_NAME;

  nResult = DeinstallStart( svDir, svLogFile, @UNINST_KEY, 0 );
  if (nResult < 0) then
      MessageBox( @ERROR_UNINSTSETUP, WARNING );
  endif;

  szAppPath = TARGETDIR ^ APP_SUBDIR;

  if ((bIs32BitSetup) && (bIsShellExplorer)) then
      RegDBSetItem( REGDB_APPPATH, szAppPath );
      RegDBSetItem( REGDB_APPPATH_DEFAULT, szAppPath ^ @PRODUCT_KEY );
      RegDBSetItem( REGDB_UNINSTALL_NAME, @UNINST_DISPLAY_NAME );
  endif;
end;


function common_MoveFileData()
    NUMBER nResult, nDisk;
 begin

  nDisk = 1;
  SetStatusWindow( 0, "" );
  Disable( DIALOGCACHE );
  Enable( STATUS );
  StatusUpdate( ON, 100 );
  nResult = ComponentMoveData( MEDIA, nDisk, 0 );

  HandleMoveDataError( nResult );

  Disable( STATUS );

  return nResult;
end;


function common_HandleMoveDataError( nResult )
 begin

  switch (nResult)
  case 0:
       return 0;
  default:
       SprintfBox( SEVERE, @TITLE_CAPTIONBAR, @ERROR_MOVEDATA, nResult );
       bInstallAborted = TRUE;
       return nResult;
  endswitch;

 end;