Chrome - eww. Makes me laugh at work when certain members of staff 'insist' that a new release of software will only work with Chrome. We install it for them and then the rest of their crap doesn't work. Uninstall Chrome and everything's peachy again - even when going back to a later version of IE. They will get there in the end, but I wouldn't touch it with yours at the minute.
Firefox all the way. In fact, a fresh install of my home Win7 x64 machine occurred today - Firefox 5.0 went straight onto it.
D.