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05 Feb 2011  

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]

First you should run a SFC /SCANNOW as the usbscan.sys is part of windows 7 driver:

SFC /SCANNOW Command - System File Checker


SFC /SCANNOW : Run in Command Prompt at Boot

This should repair that file.
My System SpecsSystem Spec