http://blogs.technet.com/cliveeastwood/archive/2008/03/03/post-sp1-issue-performance-module-could-not-find-a-performance-counter.aspxThis is a common alert received after SP1 upgrade and is being actively researched by the product group. Please see http://blogs.technet.com/momteam/archive/2008/03/01/performance-module-could-not-find-a-performance-counter.aspx for a temporary solutionen-USCommunityServer 2.1 SP1 (Build: 61025.2)