I use IE, and I've never had a virus or even a pop up (I used to have pop ups though, back in 2001).
I do have Firefox though. It just runs slower and scrolls slower than IE, and whenever I use it 4564596946 tabs come up because I like to press the little button in the middle of my mouse when scrolling down, it's a habit I have, nothing wrong with the browser, but it means it's not the right one for me.