I am so sorry that you got hit with a virus. I use the Norton 360. It is a big dog program and so far, so good with them. Kinda pricey, but worth every penny.
http://sharonschambernetwork.com/free_area/free.html
This is the moda free pattern page
http://www.unitednotions.com/un_main.nsf/free_patterns
and thier moda bakeshop is way cool.
Of course there is always the fabric sites, most all of them have nice patterns, for free.
Then there is allpeoplequilt.com and the quilting magazines. Like McCall's and quilts and more.