from said:
You need to know that not all anti-virus applications are able to stop
all viruses. Each depend on the definition updates which some
software companies can be "slow" in getting ready.
(most) Virus checkers rely on signature files, which are developed from
looking at infections, ergo some (many) careless folks get infected
before the antidote is developed, and distributed.
A Virus checker is the last resort of the intelligent user. If you don't
open unknown attachments, don't visit dubious websites, don't run file
sharing applications, and don't install Warez, and in general practise
safe Hex, your virus check, however incompetent, will probably never
have anything to do anyway.
M$ 'buffer overrun' bugs, and general system stupidities excepted,
although even many of those are plugged by a decent firewall.