Security comes in layers, but sad to say, if the hackers wants you bad enough
and is willing to spend time and resources to do so -- they will get access somewhere.
That said, take reasonable efforts to protect reasonable data and take
extreme measures to protect valuable data.
First, search this board for PROACTIVE vs REACTIVE security.
If you can stop them from gaining access, then you (in a perfect world) would
have no use for antivirus programs (no contamination would occur ).
You can only run one firewall and one email scanner (proactive tools) on a system.
You CAN have multiple antivirus programs (reactive tools) with which you manually
scan the system. (
notice: manually)
Get Spywareblaster from
www.javacoolsoftware.com -- it will stop known-bad
activex programs from being downloaded by your browser.
Lastly, you need to vigorously educate your users on email and attachments;
never open an email from a sender you do not know,
make sure your email scanner is active and kept up-to-date
and attachments ending in .exe, .com, .ocx, are always suspect.