You can go to admin cp > maintenance > update counters > update post count to do this. However, read this first:
Quote:
This will recalculate all of your user's post counts based on their CURRENT posts in the database. Do not run this if you have pruned posts, manually changed post counts, or imported from another forum package and you wish to maintain your users' current counts. Your members' post counts will PROBABLY decrease so only run this if you believe you really need to! Once they decrease you can not bring them back up without restoring your database or manually editing each user. You have been warned!
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I'd suggest trying this on a test site first to see what the results are. Also, make sure to backup your database first, just in case you don't like the results.