we have all been made aware of issues with virus and malware recently, Just a a quick link for you. Of course you should do your own research but i am currently using this software from bitdefender i use the Total Security Multi Device option which allows me to download and install on 5 devices pc or mac and even android. With some parental controls as well all at £59.95 for the year. i use this one becouse it does not slow the machine at all and also it has a auto pilot setting so you pretty much have to nothing as its all done for you, http://www.bitdefender.co.uk/
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