WLAN Extensibility Module has failed to start

I can confirm that you can safely delete the IHVExtensions key and all of its subkeys.

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e972-e325-11ce-bfc1-08002be10318}\0005\Ndi\IHVExtensions]

"ExtensibilityDLL"="%SystemRoot%\system32\Rtlihvs.dll"

"UIExtensibilityCLSID"="{6C2A8CCA-B2A2-4d81-A3B2-4E15F445C312}"

"GroupName"="Realtek CCX SDK IHV Service"

"AdapterOUI"=dword:0000e04c

That link helped me as well, I'm pretty sure the error itself is harmless, basically the driver you received from the wireless card vendor is missing a dll file that provides extended functionality (I installed the Atheros as driver only, it's possible this is something you get along with their wireless utility)

In my case the error was:

WLAN Extensibility Module has failed to start.

Module Path: C:\windows\system32\athExt.dll

Error Code: 126

In any case, if you really must solve the error message, just open regedit and search for athExt.dll (or whatever your dll is shown as)

You should only find one instance at something along the lines of:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e972-e325-11ce-bfc1-08002be10318}\0003\Ndi\IHV

You can just remove the IHV key entirely and the driver will remain unaffected, but you'll stop getting the extensibility error on start up of the WLAN.

That link helped me as well, I'm pretty sure the error itself is harmless, basically the driver you received from the wireless card vendor is missing a dll file that provides extended functionality (I installed the Atheros as driver only, it's possible this is something you get along with their wireless utility)

In my case the error was:

WLAN Extensibility Module has failed to start.

Module Path: C:\windows\system32\athExt.dll

Error Code: 126

In any case, if you really must solve the error message, just open regedit and search for athExt.dll (or whatever your dll is shown as)

You should only find one instance at something along the lines of:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class{4d36e972-e325-11ce-bfc1-08002be10318}\0003\Ndi\IHV

You can just remove the IHV key entirely and the driver will remain unaffected, but you'll stop getting the extensibility error on start up of the WLAN.

I'm having an issue with Rtlihvs.dll, I did what you said above but it shows IHVExtensions instead of IHV, is that the same?

This Link helped me http://technet.microsoft.com/en-us/library/cc735960%28v=ws.10%29.aspx

hey Russell,

was wondering if you had found the cause of your internet problem, I have been having the same problem with my wireless internet connection on my laptop which had started not long after I had purchased it as new back in April this year.  

hey Geethu,

The error message I've been getting is similar to Russell's except it is at the level of a warning with an event ID of 10002

WLAN Extensibility Module has stopped.

Module Path: C:\windows\system32\Rtlihvs.dll

The cause of my internet problem seems to only affect wireless as I am still able to connect to the net via Ethernet cable through the same network. I own a Toshiba Satellite L850D with windows 8. My laptop didn't come with any discs for reinstallation or to reboot my pc so I am unable to reboot my pc if I wanted to. Can this problem be fixed with a driver update and is the driver for wireless network the same as that for Ethernet cable?