Integral USB 2.0 flash drive 256MB

I have one of the above but have not been able to
get it to work with Windows 98. It states in the literature that it will work with W98 and USB 1.1 which mine is. I have installed the diver from the supplied CD and looked for updates on the manufacturers site and Microsoft but this did not help.
The device works with XP so it is not faulty.
Any suggestions would be appreciated.