Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: USB Driver installs with port expander but not directly into main USB

18 Oct 2016   #1
Babber

Windows 7 Professional 64 bit
 
 
USB Driver installs with port expander but not directly into main USB

I have a device which I'm having trouble installing the drivers reliably. It is a Siglent power supply and does not have any associated drivers from the manufacturer. It tries to install as a USB Test and Measurement Device which I think calls the ausbtmc.sys in the c:\windows\system32\drivers. This is all well and good and works fine if I do this using the USB Port expander...but if I try plugging the devices in directly, the driver can not installed. The device works just fine when using this driver, but I'm just at a loss as to why I can't point it to this driver directly when it comes up as an 'unkown device'. When I try to point it directly to...

C:\Windows\System32\DriverStore\FileRepository\ausbtmc.inf_amd64_neutral_cb428e1310c01373\ausbtmc.in f

C:\Program Files\IVI Foundation\VISA\IVI USB Staging\b841aa80\Windows

c:\Windows\System32\Drivers\ausbtmc.sys

and maybe one or two other places as well where this driver might exist. I either get a message saying windows found the best driver "unkown device" and installs it. Or I get an error saying..."doesn't contain a compatible software driver...make sure it is designed to work with Windows for x64-based systems."

I've even connected a new (never connected before) device and the same problem exists. Windows will find the driver and install it automatically from the port expander slots, but fails to install it when plugged directly into the PC.

I have been able to connect this device through a port expander which I need to use because I have a lot of devices connected. I've gone through a few forum threads where they talk about un-hiding unconnected devices in the device manager and removing them. Also removing /System32/DriverStore/infcache.1 and other related files in that directory. The instructions talk about removing ALL USB drivers, but this is not possible because the only access I have to this computer is through a usb mouse and keyboard. I did TRY to uninstall the ports and the mouse/keyboard shut down. I then did a hard power off and on. This did not change the strange behavior.

I've been uninstalling/removing files/updating software for the last two days now with no success. I even reverted the system back as far as I could go to see if that would help. All attempts have left me with only being able to install the devices through the expander.
In a nutshell, why would windows be fine with installing a driver when plugged into the port expander, but NOT when plugged directly into the PC?


My System SpecsSystem Spec
.
19 Oct 2016   #2
pbcopter

Windows 7 Ultimate x64 SP1, Windows 8.1 Pro x64, Windows 10 Pro x64
 
 

Hi and welcome.

Is it possible that the device is loading down the USB port when directly connected?
Does the manufacturer have any recommendations regarding USB?
My System SpecsSystem Spec
19 Oct 2016   #3
Babber

Windows 7 Professional 64 bit
 
 

I guess that this is possible. The USB hub that I am using is a powered hub. And interestingly my IT guy enabled some port setting on the PC that enables the power to the port at all times. This seemed to fix the problem...once. I witnessed that the device was recognized directly on the PC's usb port. However, I then plugged a second device identical device in and it was unrecognized. The computer went right back to not being able to find the driver.

I also used an unpowered usb hub...a real generic piece of hardware...and it worked perfectly. Go figure. So it seemed for a moment that power might have been the problem. So I'm back to square one. Why can't I directly tell it what driver to use when it clearly CAN when connected to the hub?
My System SpecsSystem Spec
.

Reply

 USB Driver installs with port expander but not directly into main USB




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
Error on all driver installs after clean install
Hi! I need help :(. Just bought used computer dell xps 7100. Looks all in good shape. Installed win 7 home premium 64 bit from a usb I made with the windows iso and usb boot disk installer utility. Installation I think goes through fine but then I get errors on all driver install files like The...
Installation & Setup
Unsigned driver installs and works on W7 64bit OS, why?
I've been running around trying to get our drivers certified because I'm told all over the internet that they won't work on W7 64 bit OS because they are not signed/certified. I just watched a guy install them on his W7 PRO 64 bit machine and the only problem he had was the conventional "this...
Drivers
main hard disk in esata port
hi all, i just noticed that my main hard disk (the one with OS) is connected to e-sata port of my mobo dh67bl. just wondering is it fine to have the main hard disk connected to e-sata port? will the performance of my system fall if the main hard disk is connected to e-sata or shud i connect...
Performance & Maintenance
Internet connection not working even when plugged directly into port
Hi there, My computer (windows 7 64bit desktop) at the office seems to be not able to connect to internet sometimes even though the cable is plugged directly into the internet port on the wall. Sometimes it works one day and then the next day when I come into office again, and it won't work. ...
Network & Sharing
KB973688 & KB954430 Installs, and install, and installs...
Hello, These 2 updates are in Windows update awaiting to install. Once (and it wasn't at first install) there was an error message and i deleted some files as directed by MS help page. Now they are always in the Windows update page, I install, no error, they are still there... Thanks for...
Windows Updates & Activation
Maybe a new bug with driver installs?
Hey all, I think that I have quite possibly uncovered a new bug with windows 7 (insert random update here). I am prepping a couple of pc's for use in a live environment and among the things that I do, disabling automatic update is one of them as well as disabling windows defender and...
Drivers


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 23:18.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App