Try taking a look at this thread. It a list of helpful programs that will help you decrease you ping and reduce lag and help you get ingame. It includes softwares that not only decrease ping, but they help the overall performance of your system
The program that I would recommend is CCleaner. This program cleans out your internet cache and cookies that try to access the internet in the services of your computer. These services can be the cause of the lag that you experience and CCleaner takes care of that for you if you do not know how to do it yourself.
Another program on the list that you might want to take a look at is Game Booster. That program closes background processes as well as extra programs that slow down your computer and also access the internet that AVA access.
Hope that helps.