Every single day we all get a hell lot of spam in our mail boxes and it looks like there is no cure for this! Your mail will have a good filter but at time some phishing mails which look like original and these are extremely dangerous ones. Some may hijack your banking information and some may cause a automatic download of viruses in to your system. You should make sure that there is a good anti virus software running in your system which will give protection from the zillions of viruses that are waiting to get in to your system and corrupt stuff.
One big concern when it comes to anti virus package is the cost. Most of the branded ones are highly priced and it is up too you decide whether they are worth the money which you will have to pay. You can get Cyber Defender which gives you excellent Free Virus Protection. It will do more than what the high priced software packs will perform. In general the misconception is that free will not be good but you will have to try Cyber Defender and you will definitely feel wrong about that statement. It provides an awesome spam killer and scam shield. Do try it out!