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For some reason, I am unable to install mass storage devices on my Windows 7 x64 machine. I see the error from the image below.

If I point directly at the usbstor.inf driver, I still get the error. If I copy the usbstor.inf and .sys files to another folder and point at it, I get a driver-not-signed warning, but the installation works correctly.

How do I fix this problem?

Enter image description here

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Look in Device manager, what is listed under Universal Serial Bus Controllers? Also run a SFC...support.microsoft.com/kb/929833 – Moab Dec 25 '11 at 16:54
Have you tried more than one "mass storage device", or is it just one device you're having trouble with? If it's just one, does it work in other computers? – techie007 Dec 25 '11 at 19:03
@techie007 This is with all Mass Storage Devices. – David Pfeffer Dec 26 '11 at 14:36
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For some reason, sometimes the file usbstor.inf disappears from the C:\Windows\INF directory. Manually putting it back fixes the problem.

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