Save the following as a batch file and run as a local admin account:
REM REM icacls c:\Windows\inf\usbstor.inf /reset icacls c:\Windows\inf\usbstor.pnf /reset reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies" /v WriteProtect /t REG_DWORD /d 00000000 /f REM REM REM REM
Note:
This will fix the installation of SP1 for Win7/2008r2 that fails because of usb being disabled.
