My passport is not prompting for my password_can't access drive?

device manager shows that everything is normal. It works fine on other machines. I try to connect to HP laptop running XP and it recognises only as a USB storage device. I can’t unlock the drive as there is no typical WD prompt… any suggestions.Thanks

WD SmartWare is not installed on that computer, or that computer’s AutoPlay is disabled

please click on the link below for further instructions

http://wdc.custhelp.com/app/answers/detail/a_id/3538/session/L3RpbWUvMTMxMTgyNDgyOC9zaWQvNDM3TXM0QWs%3D