The best I can say is to be very careful with the sites you visit. There is no real such thing as being anonymous, as you computer MUST be indentified in some way in order to recieve network traffic.
Closing netwrok ports and only leaving those used by your apps open will help too...
I just re-image my OS every couple of weeks, so issues like virii and such don't bother me so much, and I do not buy anything online.
That said, if there was a complete lack of anonyminity on the internets, hackers and such would have no where to hide. If you aren't doing anything "shady", then there's no reason for you to hide either.
Gadgets, Phones, Tablets, Cameras, TVs, HiFi...NextPowerUp
-Only real men play games THIS way.