rebuild post/thread counts

[bada_bing]

I recently added a new forum to my vb community and moved a bunch of threads from one forum to another but the thread counts are not accurate, for example I moved over 100 threads into this new forum but it only show a total of (3) threads which a new threads created since I created this new forum.. How do the counters get updated are they on a script that runs every 24 hours or do I do this manually, I looked at the counter rebuild in admincp but is says not to run this unless you are rebuilding a database so I dont want to do that.. Any idea's

Thanks