Fix Wlanapi.dll Errors

What is wlanapi.dll?

The wlanapi.dll file is required to setup a Wireless LAN connection on a Windows computer.

The wlanapi.dll module was first introduced in the later versions of Windows XP, x64, x86, SP1, SP2, and SP3. The wlanapi.dll file is also used in Windows Vista. If the wlanapi.dll file is missing you will not be able to compile or configure a wireless LAN connection.

Wlanapi.dll – Security Report

The wlanapi.dll file is a safe file and is not known to be associated with any malware, such as adware or spyware program.

Wlanapi.dll errors

Error 1

After you install Windows XP Service Pack 3, you may receive one of the following error messages, every time you start your PC:

“The procedure entry point apsSearchInterface could not be located in the dynamic link library wlanapi.dll.”


“The procedure entry point apsInitialize could not be located in the dynamic link library wlanapi.dll.”

Cause of the Error

These errors occur because wlanapi.dll associated with Windows XP SP3 replaces the wlanapi.dll file that was installed on your computer by a third-party wireless network adapter.

The wlanapi.dll that Windows XP SP3 introduces is installed in the %SystemRoot%/System32 folder. Some third-party wireless network adapters also install a file by the same name on your computer in the % SystemRoot %/System32 folder.

If the wlanapi.dll file belonging to a third-party network adapter is installed in % SystemRoot %/System32 folder before you install Windows XP Service Pack 3, the walanpi.dll associated with Windows XP SP3 replaces the wlanapi.dll file belonging to the third-party wireless network adapter.

Note: % SystemRoot % points to the folder in which Windows is installed. By default, it is C:\Windows for Windows XP/Vista.

Resolution Method

To fix wlanapi.dll error, download and install the latest device drivers of your wireless network adapter.

To download the latest drivers manually, visit the website of the manufacturer of your wireless network adapter. Alternatively, you may use an advanced and efficient driver scanner tool, such as Driver Finder to automate the driver updation process.

Error 2

When you start your Windows SP2 (Service Pack 2) computer, you may receive the following error:

“The application cannot start because wlanapi.dll was not found”

Resolution Method

Microsoft has released a hotfix for this specific problem. Download and install the hotfix KB918997 to fix wlanapi.dll error.

Error 3

When you start your Windows Vista Ultimate 32 PC, you may receive an error message, similar to the one displayed below:

“The module Regsvr32 C:\Windows\System32\wlanapi.dll was loaded but the entry-point DllRegisterServer was not found. Make sure that Regsvr32 C:\Windows\System32\wlanapi.dll is a valid DLL or OCX file and then try again.”

Resolution Method

This wlanapi.dll error appears only in Windows Vista Ultimate 32. To repair this error, perform the following steps:

  1. Click Start, type CMD in the Start Search box
  2. Next, in the Programs list, right-click cmd and then select Run as Administrator.
  3. Next, type the following command and press Enter to register the wlanapi.dll file
    Regsvr32 wlanapi.dll
  4. Restart your computer.

You may also encounter wlanapi.dll errors, if the DLL file is corrupt. Typically, a malware infection causes your DLL files, such as wlanapi.dll to become corrupt. To prevent this, ensure that you have installed reliable protective tools, such as STOPzilla Antivirus and Spyware Cease on your computer. Also, schedule regular malware scans of your entire system and keep your antimalware tools up-to-date with the latest malware definitions and security updates.