OK what im going to say has nothing to do with A.V.A,but it doe's have to do with this tool.Recently my hard drive took a crap on me and i had to re-download everything again.Im working on my game clients now.
Turn off your antivirus when you download the rar file.After you extract the file there is a folder called D3DOverrider.Take that folder and put in you're Programs File,folder,Programs file(86) if you have 64 bit.Go in the D3DOverrider and right click the D3DOverrider.exe and send to you're desktop.Go to your desk top and right click the shortcut and set it to run as administrator.See if this may work,i downloaded WoWCata and play on a private server and it's been running with no dc's or whatever.It did give me about a 20 digit drop on my latency (ms) and a 15 to 20 digit increase on my FPS.And by the way this is a very nice tool.