Avast is a good antivirus? I tried Avast from a live cd with the option thorough and detected in pagefiles.sys Patched-Ho. Then on another partition I installed windows 7 original iso, downloaded from the Microsoft site with three days of grace to turn and threw the this original pagefiles.sys same virus. This Original pagefiles.sys I detected another virus, but Avast and Panda online scans as run by Linux or other I have detected virus. Microsoft has "virus" legal (anti corsairs) that are heuristically detected as virus?