What is the best anti-viruses on the Internet for you?
How many anti-viruses programs? ???
How do I know virus programs in terms of power? :o
How strong is program avast? :
Please Give your Opinion… 
???+ ::)=
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Most of your questions is already answered here http://forum.avast.com/index.php?topic=58108.0
This part of the forum is for solving virus problems
What is the best anti-viruses on the Internet for you?
You’re on avast! forums so it would be avast. Though afterall, it’s preferential. In my case, I chose avast! because it’s free and offers so many components you wont find in any other free AVs. Moreover, avast! does not have obstructive ads.
How many anti-viruses programs?
One. You should never install 2 or more resident antiviruses. Doing so will cause system conflicts and instability.
How do I know virus programs in terms of power?
Antiviruses can be graded in many aspects: speed of scan, detection, resource use, ease of use, etc. I suggest you visit AV-Comparatives. They give detailed analysis of each AV’s aspect and in comparison to other AVs.
How strong is program avast?
Based on most comparatives, avast! is among the antiviruses with top detection and least false positives.
Hope it helps.
+1
Why do you start a new topic with the same questions, you already asked and got answered ???
Seems ‘he’ didn’t know what you meant after all… 
;D