hehe, you are going to have to manually put him back in a group.
being in nO group kills the where clause.
hrm.. i can't remember what 6.5x db looks like, but you need to add at least one group to his user profile..
i think groups used to be a string like -x-y- or whatever..
you can do that in phpmyadmin..
someone who knows the structure could supply the actual fields, but the query is going to look like
update w3t_Users set User_Groups='-3-' where user_ID=xxx
xxx woould be the user's id and the -3- is a wild assed guess on what group you need to put him in.