Are the device drivers installed correctly? (For Windows with LabPro, original LabQuest and LabQuest Mini)
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If you have LabQuest 2, see Are the LabQuest 2 device drivers installed correctly?
The Windows Device Manager tells you every piece of hardware that your computer knows about. You can access the Device Manager from the System Properties. On Windows XP, the Device Manager is accessible from the Hardware Tab of System Properties. On newer operating systems, the Device Manager is accessible from the left pane of the System Properties.
Instructions for getting to System Properties are here: TIL 2500: What version of Windows am I running? Is it 32 bit or 64 bit?

Once in the Device Manager, the devices are broken down by types. If you've installed Logger Pro, Logger Lite, LabQuest Emulator, or the standalone driver installer, you should see a type of device called "Jungo" (on 32-bit systems) or "VSTJungo" (64-bit). Note that you should see that section regardless of whether or not anything is plugged in.
If you see Jungo or VSTJungo, proceed with trouble-shooting according to option (1) below. If you do not see Jungo or VSTJungo, proceed with trouble-shooting option (2).
(1) How to trouble-shoot if you see Jungo or VSTJungo:
Expand Jungo or VSTJungo by clicking on the "+" or triangle. If you have have an interface plugged in, you should see two items:
- The interface (LabPro, LabQuest, LabQuest Mini)
- A device called "WinDriver" (32-bit) or "VSTWinDriver" (64-bit)

If you don't see the interface listed here, then the computer think that the interface is not plugged in. Try the following:
- Unplug and replug the cables (power and USB).
- Try a different USB port, and reboot the LabQuest (tap on the Home icon, select Control Panel, then Reboot).
- If you have other interfaces, cables, and/or AC adapters, you should try those as well.
If a specific piece of hardware is causing the problem, contact Vernier Technical Support to arrange a repair.

If you don't see the "WinDriver" or "VSTWinDriver" device, that is almost always caused by a modified installer, and you'll need to reinstall the software.
TIL 2102: (Windows) How do I reinstall Logger Pro 3?

There may also be icons shown on the device, specifically a yellow "!" or a red "X". Note that these will look slightly different on different Operating Systems. You may get the yellow "!" for a few seconds when you first plug the device in, but it should go away on its own. You can get the red "X" by specifically by disabling the device (the solution is to right click on it and choose "Enable").
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(2) How to trouble-shoot if you do not see Jungo or VSTJungo:
When there is no Jungo section, and the LabPro/LabQuest/LabQuest Mini is plugged in, it may show "Unknown Device," which appears and disappears as you plug and unplug the interface. It may be tempting to try to install the drivers manually from the Device Manager but that rarely works.

Assuming that Logger Pro, Logger Lite, LabQuest Emulation, or the Stand alone Driver install is actually installed, the most common cause of this problem is incorrect installation of the software.
Try the following:
- The software may have been incorrectly installed using a custom-written installer. Reinstall using the correct installer:
TIL 2102: (Windows) How do I reinstall Logger Pro 3?
Note that we do have a msi-based installer that we've written and tested here:
TIL 1681: How can I install Logger Pro on several computers? Is there an MSI file or a silent installer? - It can also be caused by a very old version of the software on a new operating system, in which case you will need to download an update from:
http://www.vernier.com/support/updates/ - Note that this is also typically where things go wrong on thin clients:
TIL 1071: Will Logger Pro or Logger Lite work in a thin client environment?
If you can get to a point where you see "Unknown Interface" on the clients themselves (not the server) it may be close to working, try the driver only installer here on the clients:
http://www.vernier.com/support/drivers/
If you are still unable to connect, contact Vernier Technical Support at 888.837.6437.
Need more assistance?
Fill out our online support form or call us toll-free at 1-888-VERNIER.