Is it the same on all USB ports?
What about other usb devices?
Have you tested another USB floopy drive in your computer?
Is USB support enabled in the BIOS?
Is Drive A:\ enabled in the BIOS?
Is the drive detected in the Hardware Manager?
Have you reinstalled the drive in Hardware Manager or Uninstalled it, & restarted for XP to autoconnect it?
Is the usb controller working properly (hardware manager properties, general tab,= This device is workign properly)?
Start\Run\regedit\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbccgp\Start = What number is in the start value? (Data values are 0=Boot, 1=System, 2=Automatic, 3=Manual, 4=Disabled)
Try a different number, if in manual (3) set it to automatic (2) or System, or even boot to see if any change.
Finally, clean the USB ports, update the BIOS, reinstall the system, instal a new USB PCI card.