How To Resolve Common wpcap.dll Errors

Wcap.dll is a dynamic link library file created by CACE Technologies for the WinPcap tool, which allows link-layer access on Windows operating systems.  Dozens of Windows applications, PC tools and games use this file, and so it is a very important one. The errors surrounding this file appear on your screen as a result of the file becoming damaged, corrupted or even going missing, and this leads to Windows being unable to read or load the file properly.  You need to resolve the wpcap.dll errors to eliminate these error messages and get your computer running normally again.  This tutorial will enable you to fix the problem easily.

What Causes The WCap.dll Error?

When you come across the wcap.dll error, one of these messages will show:

  • “The file wpcap.dll not found.”
  • “Wpcap.dll file is missing.”
  • “This application failed to start because wpcap.dll was not found. Reinstalling the application may fix the error.”
  • “Cannot start this application. An important component: wpcap.dll is missing. Install the application to fix the error”

The different wcap.dll errors that appear on your PC are primarily caused by the file damage; it becomes corrupted or gets misplaced. Either way, Windows is no longer able to read it.  The problem may be caused by an incomplete installation of WinPcap or because the installation generated errors.  The wpcap.dll error can also be caused by problems in the registry.  You need to identify the cause of the problem first of all in order to be able to fix the errors – which you can do by following the tutorial outlined next.

How To Fix The WCap.dll Error On Your PC

Step 1 – Re-Install Any Programs Causing The Error

The first thing that you need to do to fix the problem is re-install programs that cause the error message to appear on your screen. These are easily identified; any program that fails to load more than once and shows the same error message (see above) is almost certainly the cause of the problem, and so it must be reinstalled.  To re-install a program, you need to remove the program first and prepare the file installer.  To remove the program, follow these steps:

Click Start > Control Panel > Add/Remove Programs or Programs and Features (for Vista and Win7 systems) and then select the program from the list.

Click the “Remove” or “Uninstall” button and follow the uninstall wizard if there is any.

Restart your computer after you have removed all necessary programs.

Removing the program should remove the errors you are seeing.

To re-install the program, just insert the CD/DVD installer in your CD/DVD-ROM drive and run the installation command.  Sometimes you can also obtain a copy of the installer from the manufacturer’s website, if it is available.

Step 2 – Manually Replace The WCap.dll File on your PC

Reinstalling programs doesn’t always work, and indeed, sometimes it’s not easy to identify the responsible programs. If so, then manually replacing the wcap.dll file on your PC is probably the best way to resolve the errors.  You need to obtain a fresh copy of the file and then register it onto your system.  Here’s how you can do this:

  1. Download from the Internet
  2. Unzip the wcap.dll file onto your computer’s hard drive
  3. Browse to c:\Windows\System32
  4. Locate the current wcap.dll on your system
  5. Rename the current wcap.dll to wcapBACKUP.dll
  6. Copy & paste the new wcap.dll into C:\Windows\System32
  7. Click Start > Run (Or search”run” on Vista & Win7)
  8. Type “cmd” in the box that appears
  9. Type “regsvr32 wcap.dll” on the black screen

This process will provide a fresh wcap.dll file in your hard drive and will very often prevent the error message from appearing.  However, if the error persists, proceed to the next step.

Step 3 – Clean Out The Registry Of Windows

Cleaning the registry very often performs the functions described above, e.g. it fixes the damaged wcap.dll file, although it requires the use of software. The registry is an often-used database in your PC that serves as a storage for the program and file settings. It’s accessed by Windows almost constantly, whenever it needs to open a file or launch a program. Unless Windows can read these registry settings, the files and programs simply won’t work. However, the registry does sometimes get damaged, and if this happens then wcap.dll errors may appear. You can repair the errors inside the registry by using a ‘registry cleaner’, a program which can perform thorough scans, accurate detections and repair errors effectively.

We highly recommend that you use this tool which had been proven to remove 99% of faults and errors in your system and can even help stop viruses from infecting your PC enabling you to restore the optimal condition of your computer.

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Most DLL errors are caused by the "registry database" of Windows.
This is a storage facility for all the files, settings and options that Windows uses to help it run. The problem is that there is a large list of DLL files your software uses to run - this list is highly important but is continually being damaged, causing the errors you're seeing. You can easily fix this problem by using a "registry cleaner" program to repair any registry errors your system has.