1. Multikey64 Win 10
2. Devcon Failed Windows 10 Wilcom
3. Windows 10 Installation Failed Log
4. Multikey Usb Emulator Windows 10
5. Devcon Install Failed Windows 10

I'm having trouble installing OpenVPN - the TAP driver simply refuses to install.

Multikey64 Win 10

I've tried 5 different versions of the installer - including v2.1 RC19 which, according to a Google search, seems to be everyones solution.

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I recently was able to fix my HP Stream 8 after two years of leaving it untouched since it was broken. Now, I have a new problem I am facing with this tablet and that is that I cannot install this touchscreen driver known as 'Goodix Touch Controller Driver'. When I got through the agree page.

I've tried v2.1.3, which supposedly should have the driver signing solved, v2.1.1, v2.1.4 and even v2.2 beta5 - all run as administrator.
I've tried running the installers in compability mode set to Vista, aswell.
I've tried downloading the x64 driver (tap0801), from openvpn.se, and installing it manually (from a dos prompt, run as administrator, from a destination folder that isn't named with troublesome characters like space), and between the installs, i've even made sure to uninstall the 'unknown' TAP network adaptor, the installations leaves behind.
I've tried extracting the driver (tap0901) from the installer and manually install it, using same procedure as above.
... I'm fresh out of ideas on how to get OpenVPN running on Windows 7 Ultimate x64, please help.
Regards
Mads Jensen

Although this article mainly targets OpenVPN TAP driver installation issue, The problem is likely not limited to that specific driver.

You may want to continue reading and give the very easy solution at the end of the article a try.

Recently I had to install OpenVPN on a system running Windows XP (Don’t ask). The installation went smoothly up until TAP driver installation and then suddenly things went haywire:

The yellow marked status with the code of 28 in the device manager was not promising either:

In Windows XP, to install its inf file, TAP driver installation uses the built-in Windows Device Console (Devcon.exe). Pretty simple stuff, you just use devcon.exe with the install argument, supply the inf file and then provide the device’s Hardware ID.

This is the command being used to install each TAP NIC:
'C:Program FilesTAP-Windowsbindevcon.exe' install 'C:Program FilesTAP-WindowsdriverOemWin2k.inf' tap0901

Which gave a mundane error:

devcon.exe failed.

Devcon however, leaves a log file of its operation behind in %windir%setupapi.log which included these lines:

Devcon Failed Windows 10 Wilcom

#E122 Device install failed. Error 2: The system cannot find the file specified.
#E154 Class installer failed. Error 2: The system cannot find the file specified.
#I060 Set selected driver.
#I125 Installing NULL driver for “ROOTNET0000”.
#E122 Device install failed. Error 2: The system cannot find the file specified.

Now that’s our first clue. There seems to be a file missing somewhere. So after ensuring it’s not an obvious one (like a .sys file required by the inf), I was getting prepared to go deeper to debug the issue.

Luckily, turned out DaveBurnett had already done that and has shared his findings. I thank him for this as he’s possibly saved me couple of hours of struggle.

As it’s been mentioned in that post, if RunOnce key is missing in the registry (Which could easily happen by a program with a not a very well tested uninstall system), for some unknown reason devcon.exe dislikes it. So much in fact that it decides to leave the installation in half-state and complain about a missing “specified” “file”.

Just for the fun of it, lets fire up the amazing Process Monitor:

Almost right before failing, you can see the failed accesses to the RunOnce key.

The fix is utterly simple, just open cmd.exe as an administrator and use this command to create the missing key again:
reg ADD HKLMSOFTWAREMicrosoftWindowsCurrentVersionRunOnce

Windows 10 Installation Failed Log

Before reinstalling TAP driver however, first remove all the half-installed ones from the Device Manager. For each failed driver installation attempts, you will likely find different entries, some of which labeled as “Unknown device”

Multikey Usb Emulator Windows 10

To see if either of the Unknown devices are really a malfunctioning TAP driver, check their Hardware ID first:

Then just right-click on each and uninstall them.

And then you can just install TAP virtual NICs again by simply using the batch script provided in the TAP driver’s installation folder which defaults to:
C:Program FilesTAP-Windowsbinaddtap.bat

Devcon Install Failed Windows 10

Oh, You might also want to consider upgrading your OS. It’s been ages for heaven’s sake!