Geek-9pm,Indeed as already stated there are a variety avialable.I have used AVG free,Avast,& Avira free. I currently have Avira installed on both my wife's computers and mine and find them to be very good.They are real time and self updating. The initial subscription is sometimes a bit of a hassle (the registering part--which you must do). Other than that i find it to be the best of the 3 mentioned. However it really comes down to a personal preference thing. truenorth