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MTK 6218 usb modem driver problem on Win7.

Hi,
I couldn't install the MTK 6218 usb modem comport driver given by my usb modem vendor on win7 ultimate (32 bit).No problem on XP.
Is there anyone run 6218 usb modem on win7 ?
Has anyone experiences about this subject?
Where can find a suitable driver for win7 if there exist?

I am waiting suggestions asap.

Thanks.

My driver inf file running successfully on win xp is :


[Version]
Signature="$Windows NT$"
Class=Ports
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}

Provider=%MTK%
LayoutFile=layout.inf
DriverVer=11/07/2003,5.0.2153.1

[Manufacturer]
%MTK%=MTK

[MTK]
%MTK6218%=Reader,USB\Vid_0e8d&Pid_0003

[Reader_Install.NTx86]
;Windows2000

[DestinationDirs]
DefaultDestDir=12
Reader.NT.Copy=12

[Reader.NT]
CopyFiles=Reader.NT.Copy
AddReg=Reader.NT.AddReg

[Reader.NT.Copy]
usbser.sys

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

[Reader.NT.Services]
AddService = usbser, 0x00000002, Service_Inst

[Service_Inst]
DisplayName = %Serial.SvcDesc%
ServiceType = 1 ; SERVICE_KERNEL_DRIVER
StartType = 3 ; SERVICE_DEMAND_START
ErrorControl = 1 ; SERVICE_ERROR_NORMAL
ServiceBinary = %12%\usbser.sys
LoadOrderGroup = Base

[Strings]
MTK = "MTK"
MTK6218 = "USB Modem Driver"
Serial.SvcDesc = "USB Serial emulation modem driver"


Thanks for the support in advance.