*why not paste the addresses from a word document stored on my PC - and then pasting the password?*
That simply exposes you to a different risk - that rogue software will read the information from the stored document.
Really all you need is a proper, quality, AV - a good firewall - anti-spyware (such as Spybot, using the immunisation feature) - and maybe a long-stop such as Novatrix Cyberhawk.
And install all the Windows critical updates..
Also the MacAfee Site Advisor helps you stay away from dodgy sites in the first place.