I ran into similar problems when I first got beta 7 on Vista. I ranted about it on and on to my friends (among other things it trashed all my bookmarks). And then the whole thing crashed. And when I restarted FF, it prompted me to reinstall beta 7 again, and everything was fine (happily using it now).
So I think your problem is with a buggy install/upgrade, rather than the beta itself. Not sure how you can trigger a reinstall (dunno, do dumb things till it crashes), but yeah.
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I ran into similar problems when I first got beta 7 on Vista. I ranted about it on and on to my friends (among other things it trashed all my bookmarks). And then the whole thing crashed. And when I restarted FF, it prompted me to reinstall beta 7 again, and everything was fine (happily using it now).
So I think your problem is with a buggy install/upgrade, rather than the beta itself. Not sure how you can trigger a reinstall (dunno, do dumb things till it crashes), but yeah.