text: Hi,\nAVG is one of the best; available from http://www.grisoft.com. The free version is good. I bought the "buy" version for 33 dollars US for two years. Use to have Norton, but uninstalled it, like AVG much, much better. There are "definitions" downloads almost every day. They do not wait to put them in one large file, like every two weeks. You can download them when they are ready, like 2 or 3 at the time.\nI highly recommend AVG; works great on any windows system.