Hi Dinesh
How do you like Malwarebytes -- for its size and speed it is actually quite good - and you can run it in conjunction with MSE -- no probs at all --system overhead is about ZERO even with BOTH going.
Don't forget to run update the Database before scanning. Doesn't take long.
Whilst this is more Malware prevention than pure AV software I think you will find that by FAR the biggest source of infections are from Malware rather than "Classical Viruses".
Incidentally none of the older established companies such as ESET, SYMANTEC, NOD32 etc etc still have a clue how to stop DRIVE BY infections -- these are really horrible to trap unless you switch off any scripting in your browser and check source code of sites -- but without scripting a lot of sites won't work --so we go round and round.
I think BTW AVIRA is a German firm.
Please also check ESET against DRIVE BY infections -- You'll be hugely disappointed as it probably won't give you "Preventative Protection" (I.e Protection BEFORE the fact) - like most other AV software.
Malwarebytes and MSE will clean most of this stuff up (AFTER the fact -- "Reactive prevention") which is why you should run the quick scans quite frequently -- these work FAR BETTER than classical AV software since you are dealing with a totally different type of attack.
You should run a scan if you've surfed a lot of web sites - particularly if you press the BACK button on your browser and it takes you to a different page.
Cheers
jimbo