Hi Blobsie,
The Back button works for me, but it's a bit different then that of IE6.
As for uninstalling IE7, in software or add/remove programs (depends on the language version) in the "control panel" check "show updates". Previous builds then showed up under "windows XP Software updates" but the build released this month should be visible without the show updates. I noticed that the MS download pages instructs to remove the previous builds before installing the new one (by using the add/remove programs)