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KB2884256 update fails, Dexcom driver install fails
sptilton:
I just rechecked Device Manager. There are no yellow alerts. However, back on 11/11/14 there was a yellow alert under "Network Adapters" for the "Teredo Tunneling Pseudo-Interface". I was able to fix that, but it made no difference for the present problem.
If I plug in the Dexcom CGM device to any USB port, I do get a yellow alert because the driver is missing (see attachements). The normal Windows technique for finding the driver on line, on the computer, or on the Dexcom Studio CD fails to find it. It fails to install when the program is removed and then reinstalled. It fails to install when reinstallation of the driver is tried from within the program. It tries to install something called a " Virtual USB\COM driver" (see attachment)., but always fails.
The KB2884256 update came out and failed long before the Dexcom Studio program was installed. I thought they might be related because the error codes are the same and the update deals with USB drivers.
All other updates before and after KB2884256, which came out over a year ago, have loaded properly.
I tried the normal automatic and then the manual update technique. I even found a copy of the update online and downloaded it so I could try installing it off line. I tried doing it in Safe Mode. I tried using "Selective Startup" in "Diagnostic mode". All techniques failed in the same manner.
The only plug and play I could find in the Device Manager was under "System devices" as "Plug and play software enumerator" (see attachment). There are numerous listings under "Non plug and play drivers".
arez:
Hello Im on windows 7 64 bit , i changed from windows vista then suddenly i couldnt update any driver but i can still use my mouse and keyboard, I tried tweaking.com and installing from manufacturer's website but stll i always get "acess denied" repair but the problem still exist. Help will be really appreaciated. Thanks
Boggin:
--- Quote from: arez on November 29, 2014, 04:40:56 am ---Hello Im on windows 7 64 bit , i changed from windows vista then suddenly i couldnt update any driver but i can still use my mouse and keyboard, I tried tweaking.com and installing from manufacturer's website but stll i always get "acess denied" repair but the problem still exist. Help will be really appreaciated. Thanks
--- End quote ---
You will need to open a new thread of your own as two different solutions may be required.
Boggin:
@ sptilton
I'm not familiar with Virtual USBs but the South Bridge of either Chipset or the video drivers looks after the Bus Controller for USBs and downloading the Chipset and/or Nvidia drivers may help.
If neither Dexcom or Windows are able to find the Dexcom driver then perhaps the free version of Slimdrivers may have better luck ?
Look out for the box to uncheck for MyPCBackup during the installation prompts. http://www.driverupdate.net/
sptilton:
I updated the Intel DG31PR chipset driver from version 8.4.0.1016 to the latest version 9.1.2.1008 on 10/12/14 to try to fix this problem. It did not help. The Device Manager says the Nvidia driver is working and up to date.
The Dexcom Studio program does seem to find the driver, but Windows will not load it, because it says it can not find a missing file that is there (see Dexcom7.jpg, and post 1 under "DEXCOM STUDIO CGM DRIVER INSTALLATION FAILURE"). I believe the Dexcom CGM uses some sort of USB to UART Bridge VCP Driver.
I did find a problem that may be significant while checking updates thru the Device Manager. It appeared under "Human Interface Devices" , "USB Human Interface Device". There were two of these. The drivers were working, but updates were available. When I tried to update either one I got the error message "This operation requires an interactive Window station"(see attachment DriverUpdateProb.jpg).
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