Windows 7 64-bit Driver File Missing

I'm trying to manually install a device with the following driver.

; Rockwell Automation 1784-U2DHP
; Windows Driver Install file

[Version]                   ; Version section
Signature="$Windows NT$"              ; Windows NT versions
Class=Ports                   ; This is a serial port driver
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}        ; Associated GUID
Provider=%RA%                 ; Driver is provided by RA
LayoutFile=layout.inf
DriverVer=02/22/2010,1.1.1.2              ; Driver version 1.1.1.1 published on 12 September 2007 ; 1.1.1.2 Supports Signing Auto Installation
CatalogFile=u2dhp.cat

[Manufacturer]                        ; Manufacturer section
%RA%=RockwellMfr,NTamd64           ; Only one manufacturer (Rockwell), models section is named RockwellMfr

[DestinationDirs]               ; DestinationDirs section
FakeModemCopyFileSection=12
DefaultDestDir=12           ; Default install directory is \drivers or \IOSubSys

[SourceDisksFiles] 
[SourceDisksNames] 
[RockwellMfr]                       ; Models section corresponding to Rockwell              
[RockwellMfr.NTamd64]                   ; Models section corresponding to Rockwell
%USBtoDHPInterface%=USBtoDhp_Install.NTamd64,USB\VID_14C0&PID_0009  ; Identifies a device with RA Vendor ID (14C0h) and
                    ; Product ID equal to 0009h. Corresponding Install section
                    ; is named USBtoDhp.Install

;------------------------------------------------------------------------------ 
; Windows Vista64 Support 
;------------------------------------------------------------------------------ 
[USBtoDhp_Install.NTamd64]                ; Install section
Include=mdmcpq.inf
CopyFiles=FakeModemCopyFileSection        ; Files to copy are listed in USBtoDhp.CopyFiles
AddReg=USBtoDhp_Install.NTamd64.AddReg            ; Registry keys to add are listed in USBtoDhp.AddReg

;[USBtoDhp_CopyFiles.NTamd64]           ; FileList section
;usbser.sys,,,0x20                ; Copy usbser.sys, user is not allowed to skip

[USBtoDhp_Install.NTamd64.AddReg]           ; AddReg section
HKR,,DevLoader,,*ntkern           ;
HKR,,NTMPDriver,,usbser.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"

[USBtoDhp_Install.NTamd64.Services]              ; Services section
include=mdmcpq.inf
AddService=usbser,0x00000002,USBtoDhp_AddService.NTamd64        ; Assign usbser as the PnP driver for the device

[USBtoDhp_AddService.NTamd64]               ; Service install section
DisplayName=%USBdhp%                ; Name of the driver
ServiceType=1                 ; Service kernel driver
StartType=3                 ; Driver is started by the PnP manager
ErrorControl=1                  ; Warn about errors
ServiceBinary=%12%\usbser.sys             ; Driver filename

[Strings]                 ; Strings section
RA="Rockwell Automation"              ; String value for the RA symbol
USBtoDHPInterface="1784-U2DHP"              ; String value for the U2DHP
USBdhp="USB-DHP Driver"               ; String value for the USBdhp symbol
DiskName="1784-U2DHP Installation"

Which keeps throwing up the same error Error Message: "The System Cannot Find The File Specified."

What am I missing?