Getting Filter Driver working in Windows XP Limited User Account

Hi!

I have written a keyboard device filter driver to read
from a barcode scanner attached to my PC via a USB port.
The scanner appears under Keyboard in the Device Manager
as an HID Keyboard Device. My filter driver captures I/O
from this device and works ok in Windows XP in my Admin
account. However, when I switch to a Windows XP non-
admin Limited User account then my app gets an error
opening the filter driver as a device - insufficient
privileges.

Can anyone tell me how to be able to access the filter
driver in a limited user account?

Thanks, ...bruce