I would guess this is from a modification since default vbulletin doesn't have a sql query that simply says "update". Try disabling your plugins as I suggested above and see if the error goes away.
As for the second one you posted, when you see that page, you need to then view the page source and near the bottom of the page source will be something that looks like your first snippet of code in the post above - that is the mysql error. See if it is different than the one you posted.
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