Memstick Problem

I have an old 32M memstick, when I insert it into my laptop cardreader with
as an admin, ok, driver installed and data can be seen. Anyway when I logon
as a user, Vista prompted me the 2nd time to install driver... OK I typed an
admin password and driver installed and... well, the disk is "empty". No data
can be seen. For security reasons I didn't write any data on that "blank"
disk in order not to lose data. What's the problem?