Wireshark-dev: Re: [Wireshark-dev] [Winpcap-team] Help! Error installing the MS Network Monitor
From: "Matt Richards" <[email protected]>
Date: Sun, 9 Nov 2008 16:13:33 -0600
Error: "An error occurred while installing the Microsoft Network Monitor Driver (NetMon) (0x800F0203). You will be able to use WinPcap on standard network adapters, but not on Dialup connections and VPNs. Please contact the WinPcap team."

I've been struggling with this error for the past 2 hours and I finally found a solution. Now I'm finally able to run GNS (Cisco emulator). I believe the problem stems from using a heavily customized version (i.e. stripped) of Windows XP SP2. First I tried uninstall Winpcap and installing the latest beta release which didn't help. Then I tried installing Windows XP Support Tool and running "c:\Program Files\Support Tools\netcap.exe", which failed to work. So that led me down a different route which was to install Microsoft Network Monitor 3.2 from:


After installing Netmon 3.2, I ran the program and everything launched without a problem. So I ran the Winpcap beta again. Note that I still got the error during installation, but I was able to run Dynamips. This finally allowed me to launch GNS and start using it. I know other people have run into this problem and I hope this information will help avoid reinstallations of Windows.