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Removing and (re)installing software isn't going to do much.
HiCreate a new user account and try with that new, clean, account. I'm betting something in your profile got screwed up.
addusercommand gives output:
pw: user 'guest' disappeared during update adduser: ERROR: there was error adding user (guest).
Yeah, that's something that's going to happen from time to time. Simplest is to runadding new user using adduser command gives output:
vipwand save and quit (without making any changes).
That's not going to do anything as SirDice pointed out. The error is saying it can't start gdm because there is no gdm entry in /etc/rc.conf. Reinstalling is not going to resolve that as it's a manual effort.