First off, you did not get this here.
Second, I use Wireshark (the real one, not the fake Antivirus malware that you got), and the real company that makes the real Wireshark has put up a page about the fake malware, here:https://www.wireshark.org/news/20100804.html
Scroll down to the second paragraph where it says "If you are infected" and there are links there to four different legitimate sites that will tell you how to get rid of this.
AVG will not help now that you already have it. However, once you get rid of this, you should install good antivirus and firewall software. I recommend AVG Free 9.0 for antivirus and Comodo Free for firewall. Turn off the link scanners on both and select only Firewall when you install Comodo.
Also, run Windows Update and download and install all critical patches. You will need to get rid of the malware first, as it will block access to the updates.