I've had the same problem with windows 7. I finally got it fixed by manually copying usbser.sys to the "C:/windows/system32/drivers" folder.I then adjusted the "Arduino UNO.inf" file by commenting out the following:[DriverInstall.nt];include=mdmcpq.inf;CopyFiles=DriverCopyFiles.ntAddReg=DriverInstall.nt.AddReg[DriverCopyFiles.nt];usbser.sys,,,0x20After that i reinstalled the driver via the Device manager.
i got it working. the included files will only work for amd64 win 7.
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