A few posts ago, I discussed the Browser Wars. While everyone has their favorite browser, you will always have a better web experience if your browser is the most up-to-date version available. Many website designers and web software developers don’t bother trying to accomodate very old browsers, so if you’re running IE6 (or heaven forbid, IE5), you should consider an upgrade.
Upgrading your browser is almost always free (it is definitely free for the most poplar browsers like Internet Explorer, Mozilla Firefox and Google Chrome) and pretty easy to do. You can upgrade without losing your bookmarks/favorites. This link describes the reasons you should stay current with your preferred browser, and links you to the newest versions available.