Check that SYSTEM has Full control on 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR

Ensure you don't have any GPOs that govern device driver installation, 
restrictions or signing requirements.

-----Original Message-----
From: L. M. Rappaport [mailto:[email protected]] 
Sent: Friday, July 13, 2012 4:48 PM
To: NT System Admin Issues
Subject: W7 workstation cannot install drivers

I'm trying to figure out why a Windows 7 Business Pro 64 bit workstation will 
not let me (a member of the Administrator's Group) install any drivers.  It 
allowed driver installation before, but it will not permit the installation of 
a driver for a blood glucose meter (Bayer Contour) (it uses a USB to serial 
converter) or a Fitbit pedometer also USB.  

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