Microsoft today released an updated KB Article detailing the recommended WMI hotfixes that should be deployed to your Windows clients.
This is especially relevant in environments using System Center components as these make heavy usage of WMI.
It doesn't mention it within the KB Article, but I think it's safe to say these hotfixes are assuming that you're also running the latest service pack for the relevant OS but even if that isn't the case, I would certainly recommend it.
N.B. Thanks to Marnix Wolf for the tweet that highlighted the updated KB to me!