Windows 7 x64 Driver Issue

We are beginning our deployment of Windows 7 64bit.  I have come across an weird issue with drivers on certain PCs.

Install a machine fresh with Windows 7.  Add a user to the PC as an Admin (for installation purposes) and the user cannot add a driver for a printer or a scanner.  You receive an "Installation failed" message from whatever software package you are intending on installing.

If you try to add the drivers using device manager and pointing Windows to the actual driver it say that installation failed and "Access is Denied".

This is happening across multiple platforms so it's not hardware specific.  The weird thing is you can reinstall the machine and it works fine.  I've never seen anything like this before.  

Again, this user is a local Admin.  I've also tried with another ID that is a Domain Admin and the results are the same.

Additionally, I have even booted in the "Disable Driver Signing"  Mode of 7 without chance.

Now, when it works, the user is prompted with an "Install Driver" Prompt.  When it failed, they don't.

It's just Odd.
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NCHADMINConnect With a Mentor Author Commented:
The problem was with removing the User  accounts from the "User" group and adding them soley to the Admin Group.  We used to do this with XP and Vista without issue.

Microsoft has removed Admin Group from the following file:  C:\Windows\System32\DriverStore\infpub.dat

This file allow hardware to be added to the Windows driver database.

Simply adding a user to the "USER" and "ADMINISTRATOR" groups solved the problem.  These are IT developers that require local Admin rights on their machines.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Make sure you open the Device Manager/Computer management as an admin - when you log in, you may be in the admin group, but you do not automatically have all admin privileges.  You must EXPLICITLY request to run the app as an admin (right - click and select run as administrator).
NCHADMINAuthor Commented:
We have used that "Run as Administrator" on both the installing.exe and Device Manager.  The same process for drivers has been used for both machines that work and the ones that don't.

Just as a side note, these machines are being imaged with MDT2010.  I don't know if that matters.
Chetan KhuranaTechnical ManagerCommented:
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