What antivirus do you use?

That sounds good, well I am currently using avira antivir personal classic edition. I have been using this for over a longer period of time. Since using it, I have never experienced any problems at all with regards to the overall function and system performance of my machine. Otherwise, I am so impressed and satisfied with its performance. It updates on a regular basis and can be scheduled at your most convenient time. It is very light on resources and does not use a lot of memory. Hence, does not slow down your computer. Have a nice day and God speed!

i am using AVG 7.5 in my laptop and norton in my desktop and i am happy

I use BitDefender 9 Professional Plus and it's good. In the past I used Norton Antivirus but it wasn't so good.

i use avast antivirus, home edition...it works vert well. i am satisfied...

I use the free version of avg too. I'm quite satisfied with its performance. No resource hogging and regular updates are definitely a plus with this one. I'll probably be using this for a long time to come.