Free programs are never completely as secure as the programs you are paying for.
Therefore I always recommend not to install either AVG free or Avast free, but one of those 2 in combination with 2 other programs.
AVG freehttp://free.avg.com/
or
Avast freehttp://www.avast.com/eng/avast_4_home.ht…
Then the 2 programs you should install togehter with one of the above.
Threatfire is an anti virus, that can be installed next to any other anti virus program on the same computerhttp://www.threatfire.com/
There is a lot of mal ware you have to protect your pc against.
This is a very good program, that completely runs in the backgroundhttp://www.comodo.com/boclean/boclean.ht…
Installing these 3 programs, will not use any extra RAM or CPU usage.
Your computer will be very well protected and it does cost you nothing
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