My external drive is working, but Windows still prompts for driver

I have a 500GB LaCie drive, which windows recognizes after I plug in the USB
cable. The drive is working, but Windows still prompts for driver:
"Windows needs to install driver software for your LaCie Hard Drive USB"
There are three choices: 1) Locate and install driver 2) Ask me later. 3)
Don't show this message again for this device."
I can close it, and everything's fine. Every it prompts every time I plug in
the USB cable. By selecting those choices, Windows simply disconnect the
drive.

How do I get rid of the redundant prompt?