Trend Micro Internet Security Pro is all I have ever used on my one year old laptop and I have never had any issues. It runs scans in the background without interrupting activities and then notifies you of resolved and unresolved issues the scans detect. It also updates smoothly. The blocked site feature comes up a lot but it is easy to add or remove sites from the block list. Best of all it isn't a memory hog like Norton and many of the other security suites out there.

I tried many kind of security and antivirus software but this one(Trend Micro)never failed me, now I'm using it for 8 years and renewing and upgrading every year.

I had Panda, Norton, Kaspersky, CA, McAfee and BitDefender under test and failed or too simple or slowed down the system.
I am selling software and computer parts with installation so that's easy to test them all. If You want to buy a good internet security go for Trend Micro.

I personally like TREND MICRO as a back up plan. I use Norton but when the computer is acting weird I will go to the Trend Micro page and run the free virus scan. I hate to say this because I actually had to pay for the Norton but the Trend Micro has caught virus and spyware that Norton did not even catch.
I have been seriously contemplating getting rid of the norton and buying the Trend Micro product. The price is also better. The price is only $49.95 for one year.
If you'd likew to try it out how can you possibly go wrong trying a free version? You have nothing to lose!