Many people are paying hundreds of dollars for anti-virus and anti-malware software on their computer. After the initial investment, some companies offer to "keep your computer secure" for an annual or monthly fee. These programs often bog down the system and cause annoying messages to frighten you into buying more of their products.
This is really not necessary. I have found for my personal use that Microsoft provides all that I need fro free. Yes, Microsoft provides things for free.
