McAfee, Kaspersky, Avira, Malwarebytes, AVG, BitDefender, ScanGuard, Total AV, and etc. have good products that are free*(at the cost of telemetry, of course, but which company doesn't this day?, besides is the best way to keep ahead and up to date with all kinds of common malware's); but this days, fighting the day-to-day good fight is on the abuse of massive advertisement, the planting of "cookies" for tracking and profiling trought it and etc, about that, just an open (manageable) and good "Web Browsers" will do the job, the modern ones are still compatible with such OS version and have the option of add-ons/plug-ins that can alleviate such load (bandwidth + CPU/GPU usage).
Otherwise all apart from the rest is just mental!...