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Administrator login prompt when attempting to use USB device

By frank ·
On a fresh and fully built Windows XP Professional SOE, we get the following prompt when attaching USB devices:

'You must be a member of the Administrators group on this computer to install this hardware:'

All users are member of the local Power Users group and we have 'Load and unload device drivers' enabled for the Administrators and Power Users local groups.

Any and all help would be appreciated

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hint only

by joheax In reply to Administrator login promp ...

I am trying to fix exactly the same trouble which according to this article is "by design":;en-us;326473
However, when I upgraded to Windows XP from Windows 2000, all flash drives I had plugged in installed even for a standard user. Now I know there must be a way of enabling this very wanted feature on a clean install too! It is not file access related I think, more likely it is somewhere in the Windows registry database...

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solved !!!

by joheax In reply to hint only

I won't tell you what I have gone through when investigating this terrible and absolutely misleading issue. It cost me some sleepless nights. However, I have finally proved it is (in my case) related to bad hw driver definition in the Windows registry. I had tested and repeated that behaviour even on a fresh installation of Windows. So what was the ultimate solution? I went to this registry key:

In that key there were two values:

I deleted the latter and voila!

You may want to play with other (conflicting) Upper/Lower Filters, however some changes will likely cause the BSOD (it happened to me too). In such a case you simply let Windows rebuild the last state during the next boot...
I have found a good reference and even scripted tools for the Upper and Lower filters here:


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