Kasperky has served my needs on my three computers for more than 10 years. Never had a virus, malicious software or other problem unlike friends who use freebies such as AVG and others. All get problems once in a while.
You pay hundred of pounds/dollars for a computer then want it protected for free. You get what you pay for. Suffer if you must!
A word - don't buy from the manufacturer of programs, buy them via Amazon for one third of the price - a bargain.