laviniuc :
even the free microsoft security essentials works ok. nod32 is another favorite of mine
I am using Avast . The latest version of NOD 32 scans and detects USB at a slow rate , thereby postponing windows' detection of USB devices.
So, I will be on Win 8.1 , and as far as I know MSE is already integrated in 8.1 .
So, what is the other choices ?