USB external drives not recognized

My W7 64-bit machine stopped recognizing USB external drives and thumbdrives.  I found a post on the internet about some systems not having  the required USBSTOR.inf file.  My machine was missing this file so I created one and copied the recommended text into it - file is attached.  My machine will now recognize my Seagate FreeAgent GoFlex external drive (which it didn't before) but just gives the same 3-beeps when any others are connected.

Are there additional entries in the usbstor.inf file that need to be made for other drives? Is there another file that needs to be created or modified
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JohnBusiness Consultant (Owner)Commented:
USBSTOR.inf is the file Windows uses to install USB keys. If it was working up until recently, there may be another reason why USB keys are not recognized.

Try running System File Checker to see if it can repair USB for you. Run SFC /SCANNOW and allow to complete. Run again if errors remain after the first run.

Restart your computer and test.

... Thinkpads_User
Thomas GrassiSystems AdministratorCommented:
When did this start happening?

You could always try to go back to a know good system restore point

You could also be infected by a virus of some kind have you checked ytour anti virus software?
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MRGroupAuthor Commented:
SFC /SCANNOW didn't come up with any errors. No viruses.  Any other ideas?
Thomas GrassiSystems AdministratorCommented:
did you try the system restore point?


If that file was missing you might want to do a install of win 7 doing a system repair
that only installs windows 7 files does not effect your personal configuration

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JohnBusiness Consultant (Owner)Commented:
If you need to do a Repair Install (if a restore point won't work), here is a Microsoft Support article for doing a Repair Install:

and here is a Seven Forums Tutorial to expand on that:

.... Thinkpads_User
i would look first in device manager, to see if the usb is installed without errors.
if needed, update the chipset driver for your motherboard
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