I'm trying to find some sort of connection between Air Advantage and Ad-Base Systems/Group, but nothing's coming up so far. I'm still looking into it, but it seems a little suspicious to me.
I'm going to have you try something real quick. It's something I would normally advise against (anyone else reading this should not try anything like this), but I'm curious. I'm going to go ahead and have you remove the entry in question. If it's not supposed to be there, then everything should be fine. If it's actually important, then it will likely disconnect you from the internet, but I will explain how to reverse the process...
1. Open HijackThis (sniper) and click on Do a system scan only.
2. Check the following entry:
O17 - HKLM\System\CCS\Services\Tcpip\..\{CA02BDA1-5EF4-4FAD-8EE0-38DC0765AED5}: NameServer = 64.136.173.5 64.136.164.77
3. Click on Fix Checked.
This will remove the information from your computer's registry. Now try performing your regular online activities. Are you able to be online normally? If following my steps has broken your internet connection, then do the following...
1. Open HijackThis again.
2. Click on View the list of backups.
3. Place a checkmark next to the entry you removed, and then click on Restore.
This should return your internet access. It may require you to restart, but you shouldn't have to.
Give this a try and see what happens.