When I got my new(est) computer last year, I loaded Norton Systemworks, which includes Norton AntiVirus. About $70.00 for the whole suite at Office Depot. I contains all kinds of tools for keeping your computer healthy and in good running order. It's saved my posterior on more occasions than I care to count (like when you hit the delete button and deep-six the book you've been working on for the past four years -- but easily resurrect it with Norton UnErase). Within the past three weeks, I've been hit with the KakWorm virus no less than three times (comes in on somebody's e-mail). Norton AntiVirus identified it and nailed it coming through the door!Can't recommend it highly enough. Just be sure to use LiveUpdate frequently -- I use it at least once a week.
Don Firth