I have tried this on two boards same result on both.

The boot loader is the latest on both although that shouldn't make a difference.

The board did work a week ago on this machine (Windows 7 64bit).

I plug in the FRDM-KL25Z in device manager it looks like this...

I have tried

1. to update the driver automatically - this fails

2. to manually point the driver update by extracting the files from the serial port exe (mbedWinSerial_16466.exe) and specifying it to use mbedserial_x64, I get this result...

What is the problem?

Anybody?

Does the MSD part work? Especially weird if it used to work. Tried another USB port? (Mainly important if you have more than one USB controller, for example USB2.0 and 3.0 ports). Did you also remove the drivers? (For example of that mbed Composite Device it shows). Tried another USB cable? USB hub in between?

yes i tried all the usb ports same problem, dont have a hub. Yes the MSD part works...

If MSD works I don't think a hub is going to make a difference. Did you also try to delete the drivers and re-install them?

yes I did, same problem, is there any extra data or log files I can get that might help solve this

I get the same problem

In the image I've got a working mbed that I bought ages ago, and one that I bought recently that wont install correctly.

I've read the advice above but it hasn't helped. Any suggestions? I've tried:

-mbedWinSerial installer file from the mbed site -many different compatibility settings when installing -different cables