This is an opinion question, If 100 people answer, you may get 100 different answers. It can be Norton, AVG, NOD32, KAV, avast!, AntiVir, McAfee or a hundred others. They are all good. Just use the one that works best for YOU. BTW, I never heard of the one you are using, escan??
which is the best anti virus available? i am currently using escan.is it good enough? if not, which one should i buy?