CDC USB driver not installing on Windows 7 -64 bit

Hi,

i am facing problem When I attempt to update the driver Windows returns the following error message:

Windows could not find driver software for your device.

If you know the manufacturer of your device, you can visit its website and check the support section for driver software.

I have include my driver.inf file below:

;
; Keil - An ARM Company  Comunication Device Class driver installation file
; (C)2007 Copyright
;

[Version]
Signature="$Windows NT$"
Class=Ports
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
Provider=%Keil%
;LayoutFile=layout.inf
DriverVer=01/06/07

[Manufacturer]
%Keil%=DeviceList

[DestinationDirs]
DefaultDestDir=12

[SourceDisksFiles]

[SourceDisksNames]

[DeviceList]
%DESCRIPTION%=LPC17xxUSB, USB\VID_1FC9&PID_2002

;------------------------------------------------------------------------------
;  Windows 2000/XP Sections
;------------------------------------------------------------------------------

[LPC17xxUSB.nt]
include=mdmcpq.inf
CopyFiles=DriverCopyFiles
AddReg=LPC17xxUSB.nt.AddReg

[DriverCopyFiles]
usbser.sys,,,0x20

[LPC17xxUSB.nt.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,usbser.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"

[LPC17xxUSB.nt.Services]
include=mdmcpq.inf
AddService=usbser, 0x00000002, DriverService


[LPC17xxUSB.nt.HW]
include=mdmcpq.inf

[DriverService]
DisplayName=%DESCRIPTION%
ServiceType=1
StartType=3
ErrorControl=1
ServiceBinary=%12%\usbser.sys

;------------------------------------------------------------------------------
;  String Definitions
;------------------------------------------------------------------------------

[Strings]
NXP="NXP - Founded by Philips"
DESCRIPTION="LPC17xx USB VCom Port"

Please help me in finding the solution thanks in advance