This can be caused by several reasons:
a. Tampering with INF files store
b. Tampering with CAT files storage, root certificates or security provider.

Regards,
--PA

"Frederik" <Frederik@discussions.microsoft.com> wrote in message news:6609B3CD-60BC-4080-BD6C-33FC640FE128@microsoft.com...
> Hi Doug,
>
> I have the same problem, when users (which aren't member of the
> administrator group) attach a usb storage device, windows prompts for the
> administrator password.
> It even gets worse, when we (after filling in the password and installing
> the device) attach the device to another port, windows again prompts for the
> password.
> After installing windows xp, we are also having this problem with other
> devices.
>
> Did you manage to find a solution?
>
> Frederik.
>
> "Douglas O'Neill" wrote:
>
>> They are in the "everyone group"
>> I should have also mentioned that only this group of PCs have problems; all
>> others in my area are fine.
>>
>> Doug
>>
>> "smiling face" wrote:
>>
>> > You will have to put the users in a group that can access external devices.
>> > In what group are they?
>> >
>> > "Douglas O'Neill" wrote:
>> >
>> > > I am an administrator looking after several PCs that have Windows XP Pro,
>> > > connected to a Windows Server 2003 domain.
>> > >
>> > > If a student plugs a mass storage USB device (key, mp3 etc) into a USB port,
>> > > it will ask for an administrator password.
>> > >
>> > > Is there any method that can be used to get rid of the need for a password
>> > > to be typed in?
>> > >
>> > > Thanks,
>> > > Dug