Kaspersy has been awarded several times because of its reliability.
It doesn’t need a lot of memory to run perfectly and detect on your computer a big number of viruses and maybe the most important, prevent them.
Kaspersky will find the viruses even if they are encrypted as compressed files.
In addition you can update it evry week or when an alert is evident. IOne thing is sure, if you have kaspersky installed you can surf the internet safely and this is a very good reason to hae it installed.