Win7 speed issue

I'm trying to use libUSb-Win32 with USB-to-TTl serial converter to send raw
data just to test making usb driver on windows, the problem is that data
rate monitored on the bus using USBLyzer is 6.6msec per bit ! how can i
increase the speed to maximum available speed ? 

N.B. Data is send correctly with no problem in data itself, the problem is
with speed. 

Here is my code: 
=========== 

    usb_init(); 
    usb_set_debug(255) ; 
    usb_find_busses(); 
    num = usb_find_devices() ; 

    printf("Devices: %d\n", num) ; 

    busses = usb_get_busses(); 

        for (bus = busses; bus; bus = bus->next) { 
                struct usb_device *dev; 

                for (dev = bus->devices; dev; dev = dev->next) { 
                        if ((dev->descriptor.idVendor == 0x067B) &&
(dev->descriptor.idProduct == 0x2303)) { 
                                mydev = usb_open(dev) ; 

                                if (mydev == NULL) 
                                { 
                                        printf("Error: usb_open\n") ; 
                                } 
                                else 
                                { 
                                        printf("Device opened\n") ; 

                                        mreturn =
usb_set_configuration(mydev, 1) ; 

                                        if (mreturn != 0) 
                                        { 
                                                printf("Error:
usb_set_configuration\n") ; 
                                        } 
                                        else 
                                        { 
                                                printf("Config. set\n") ; 

                                                mreturn =
usb_claim_interface(mydev, 0) ; 

                                                if (mreturn != 0) 
                                                { 
                                                        printf("Error:
usb_claim_interface\n") ; 
                                                } 
                                                else 
                                                { 
                                                        printf("Interface
claimed\n") ; 

                                                        mreturn =
usb_bulk_write(mydev, 2, data, 1000, 0) ; 

                                                        if (mreturn < 0) 
                                                        { 
                                                               
printf("Error: usb_bulk_write\n") ; 
                                                        } 
                                                        else 
                                                        { 
                                                                printf("Data
sent\n") ; 
                                                        } 


                                                       
usb_release_interface(mydev, 0) ; 
                                                } 
                                        } 
                                } 
                        } 
                } 
        } 



and here is USB info by testlibusb-win: 
========================= 


bus/device  idVendor/idProduct 
bus-0/\\.\libusb0-0001--0x067b-0x2303     067B/2303 
- Manufacturer : Prolific Technology Inc. 
- Product      : USB-Serial Controller 
bLength:             18 
bDescriptorType:     01h 
bcdUSB:              0110h 
bDeviceClass:        00h 
bDeviceSubClass:     00h 
bDeviceProtocol:     00h 
bMaxPacketSize0:     40h 
idVendor:            067Bh 
idProduct:           2303h 
bcdDevice:           0300h 
iManufacturer:       1 
iProduct:            2 
iSerialNumber:       0 
bNumConfigurations:  1 
  wTotalLength:         39 
  bNumInterfaces:       1 
  bConfigurationValue:  1 
  iConfiguration:       0 
  bmAttributes:         a0h 
  MaxPower:             50 
    bInterfaceNumber:   0 
    bAlternateSetting:  0 
    bNumEndpoints:      3 
    bInterfaceClass:    255 
    bInterfaceSubClass: 0 
    bInterfaceProtocol: 0 
    iInterface:         0 
      bEndpointAddress: 81h 
      bmAttributes:     03h 
      wMaxPacketSize:   10 
      bInterval:        1 
      bRefresh:         0 
      bSynchAddress:    0 
      bEndpointAddress: 02h 
      bmAttributes:     02h 
      wMaxPacketSize:   64 
      bInterval:        0 
      bRefresh:         0 
      bSynchAddress:    0 
      bEndpointAddress: 83h 
      bmAttributes:     02h 
      wMaxPacketSize:   64 
      bInterval:        0 
      bRefresh:         0 
      bSynchAddress:    0 


Thanks



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