This is solvable if you still have your files on the windows 98 computer and on the windows xp computer.on the xp computer, search for files named V_PLBOOK.* and make note of the directory they appear in (e.g.: c:UFTLibrary)
Next make a backup of your database.Then, check your windows98 computer to see where your V_PLBOOK.* files are storned.Copy the three V_PLBOOK files to the directory on your xp computer (e.g.: c:UFTLibrary), overwriting the files already there.You can do this by using a flash drive, if you have usb on both computers.