This Kingston USB driver package is for the Kingston DataTraveler II and DataTraveler II Plus. It is needed only for Windows 98. Windows Me, 2000 and XP already have the driver (if you are having trouble using the drive on these systems, then it is likely to be a conflict or problem in Windows - see the Windows Device Manager and Windows Help file for details).
After you download the driver package, make sure that the Kingston drive is NOT plugged in. Run the setup program and once it has completed, insert the drive.