Using alot of anti virus's at the same time is not all that good. They can create problems and errors.i've already used some trusted anti-virus for years now. i've already tried avg, symantec, nod32, avast. the one im using now is the avast. but i only use that for specific kind of viruses, because i know that there are kinds of viruses which a single anti-virus cant delete or remove. i also use "noob killer" and "class-x.bat" for back-up. because if a virus disabled my current anti-virus, one of the two will sure kill that and re-enable my anti-virus after they've scanned my pc.