Read the reviews on PC Magazine, InfoWorld, and any other favorite major
magazine that has published a review of computer security software -
AntiVirus, AntiSpam, Software Firewalls, Hardware Firewalls, etc. Decide
what you need to protect your system(s).
I would recommend, as a minimum, a hardware firewall if you have DSL or
Cable such as Netgear, Linksys, or D-Link. This will stop most attacks on
your system. If you still use dialup, then you need a software firewall.
Then you need a good, frequently updated (several times a day) AntiVirus.
If you need a software firewall, get the paired version to remove conflicts.
You need a good AntiSpam such as the free Ad-Ware. You have to do manual
scans with it.
Some of the all-in-one AntiVirus and Firewall packages do AntiSpam too. I
think Norton's Internet Security offers all in one. The latest version has
full Vista support including 64-bit versions. It also has been rated a much
lower impact package compared to previous versions. It has been said that
it just takes the safest path automatically instead of pestering the user to
make decisions they aren't equipped to understand.