Thanks Deity Yes I knew that existing PC's with the combined Malwarebytes and Microsoft Security Essentials will be perepetually protected, and that the combination of those 2 programs is about as good as it gets for protection - while still be a virtually no maintenance solution with minimal pop-ups to puzzle the mums and dad users. My point is that I will not do this in future ie. I will not be buying Premium whereas I bought hundreds of Pro for my customers. I note your point about MS Security Essentials is not good enough by itself - particularly with the takover of many PC's with PUP's, which are not virus's but are making the internet so slow for users because their internet browsing is redirected through slow advertiser's servers in the US. Most anti virus's programs did not flag PUP's in the past - but that seems to be changing. So I am now looking at what to do in future - Comodo perhaps. Perpetual licenses are what I want - not subscriptions. I don't mind the initial cost.