Hello clearlyclearly
I suggest that you configure your updates so that they are automatically detected - but you decide whether or not they are installed, please note that you should install all important updates as a matter of fact and only disregard the optional ones if you are 100% certain that by not installing them the computer will not suffer any detrimental affects, for configuring Windows updates please see
hereNB: emeraldnzl is the authority on rootkits etc and so I am not best placed to comment in that area, I do however feel that there is a strong possibility that the initial issue may have been the result of an out of date OS, which BTW does pose a security risk.
You are as ever most welcome