Regardless of whether or not you visit "shady" sites, Virus's don't discriminate. When they are "in the wild" they can be anywhere, including perfectly trustworthy sites. Paid or free? Of the free programs, Alvira's Antivir (free version) has been rated #1 by several testing sites. Also an excellent choice is Avast as well as AVG. If you want free, I would suggest Antivir. Of the paid programs, one of the most hated companies for the past ten years has, once again, taken the lead------Norton Internet Security. What used to be the most overbearing and resourse-hogging headache is now a lean and proficient antivirus suite. Someone at Norton deserves a medal because they listened to people's complaints---made changes, and released a product that even the worst haters actually love. Stay away from Mcafee and Trend Micro. They work, but are not in he "top 10" of tested programs. Again, the paid version of Antivir is good also, but none can top Norton. For Malware programs, the free version of Malwarebytes is tops. The paid version gets you updated definitions much faster and is actually worth the money. Another must-have (in my opinion) is WinPatrol. I have been using it since its inception and would not be without it. You may want to visit winPatrol's website and learn about it. It is one of the best coded programs around and takes hardly any resources to run it. WinPatrol has a very large and dedicated following and is indespensible, in my opinion. Good Luck!