vinod12345madhu
i am using avira as it detects more viruses in a short span of time. and similtaneously i am using microsoft security essientials by microsoft
using multiple antiviruses on one system is a foolish thing to do. most people do this as they do not know about the disadvantages of doing so and are equipped with the misinformation of the so called 'advantages of using multiple antivirus software'.
antiviruses use a technique called real time scanning which uses dedicated cpu resources to remain active in the computer memory and scan items in real time. keeping multiple avs on one system causes these avs to cause a tug of war with these resources which effectively means that neither of these work properly.
also keeping multiple avs increases the chances of false positives which are highly undesirable.
avira has the highest detection rate but also a considerable false positive detection rate. also its pop up (don't know if they've removed it now) can be highly irritating while playing games or watching movies as it tends to minimise the current object on screen.
Remember that no Av is perfect and that all of them have their highs and lows. At one point of time Kaspersky was the best but its performance has degraded since past 1 year or so. Symantec Av was the worst until a couple of years ago and their latest product is light and good at performance. Avg has degraded a lot. Fsecure, Gdata, Bitdefender are quite good.
Understand one thing that its better to check for anti viruses that suit your usage better. One av may suit one's usage better while another may be good for someone else.
regularly check for reviews(atleast every 3-6 months) to see which one is performing best during that point of time. there are many review sites which may help with such information. <a href="https://www.av-comparatives.org" target="_blank" rel="nofollow noopener noreferrer">Home - AV-Comparatives</a> is one such site/organisation one can check into.
I prefer and use Avast. Its not the best but its been regularly good-best for the past couple of years and suits my internet and data usage. A good av with a good firewall can provide optimal security to a computer. and these can be done by free ones too. No need to spend big bucks(most of the time) to get these services.