I have had problems with Home Premium edition not recognising some of my USB
devices, USB memory sticks and my Sandisk Sansa e260 in particular (which is
set to act as a mass storage device). I get the USB Device Unkown error

Having contacted Sandisk they informed me that I am missing the following
files

usbstore.inf
usbstore.sys

Whilst I can find similarly named files I can't find any information on
these two.

Regards,
Ian