It's not important whether you use a computer all day or only occasionally. Even more important is the presence of antivirus software that should have been installed in the computer. In the antivirus problem, you will find two well-known names in computer virus protection, ie norton and MacAfee.
Both offer a good solution and quite popular.The other solution is there is service Symantec's online virus scan and also the various free antivirus programs that can be searched online. If you are looking for software, do not forget to note the status, would enter into the group of shareware, freeware or paid? Usually shareware and freeware is still in development stage, so that's not the right choice to be installed.