Recently I just upgrade my PC from Windows 98 to XP Pro. I was also using a PQI USB2.0 thumbdrive (flash drive) with driver for Win98. However after the upgrade, the Windows Explorer didn't show the Removable Disk when I plug in the USB Flash Drive. I checked with Device Manager and it shows that the USB Mass Storage Device is detected and no error reported. But the Windows Explorer still didn't show the Removable Disk. Can anyone help?