This is very simple. Buy it and keep it up to date.
At a cost of approximately £30 per machine per year, it is cheap compared with the down time, loss of data or loss of credibility that viruses can cause.
It is also important to:
My current favourite virus protection is Trend Pccillin. My reasons for this are:
I've also had good experience with the performances of Mcafee however switched because the buying process was tortuous and no discount was offered when buying multiple licences.
I've had bad experiences with:
Adware/Spyware are little programs that monitor your browsing, often used to target advertising based on your website. It is seen as an invasion of privacy.
Phishing programs go one further and try to collect key information e.g. your username and password for your internet banking. An example of phishing scam is the email that get sent randomly. For example:
On the website you'll be asked to enter bank login information and the originator of the email will then be able to transfer money from your account.
NEVER enter all you bank details onto a page. Your bank will only ever ask for part of this information.