Invisible USB

I am using XP (Service Pack 2) at work in Liverpool, England.

I put a Flash storage device in a USB port this morning, but the device
didn't appear in My Computer like it normally does.

I looked in the device manager, and the memory stick was listed normally
under 'USB controllers', and described as working properly in the status box.
The stick is fine: it works in my boss's computer. I've followed the device
manager troubleshooter right the way through to uninstalling the USB drivers,
but to no avail.

The problem might have arisen last week, when I plugged a digital camera
into the USB port without having installed the camera driver. I've since
installed, and then uninstalled the camera driver, but it made no difference.

When I plug the flash memory stick into the USB, the stick lights up as
normal.

Why isn't it appearing as a removable storage device in My Computer?
--
Alec
.

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