I also confess to using IE9 as my default browser, and also not had any problems with it, except for copying and pasting code, which it messes up religiously.
Although I'm running windows 7 64bit, I use the 32bit version of IE9 as it never causes me problems. The 64bit version did. Both versions are installed in windows 7. Might be worth trying Jinky, if you haven't already.
I have Firefox and Chrome installed too, and use these for testing, and moving code about. Firefox also has some nice addons such as firebug, so finding and altering web code is made easier. Chrome also has its own version built in, on a right click, "Inspect element" Really handy.