I keep getting over charges for too much internet usage. I have been using very large amounts of data and I have no idea why. By elimination I have pinpointed it to my desktop. I ran some virus scans and did not find anything. I use ebay, amazon and facebook quite a bit. I try to be careful about what I use, there is no porn or things like that that I am aware of being used on my computer. I have windows 7 pro. Please, can anyone help me figure out what is using my internet and how to fix this?