Apply 64 bit Fix before Applying SP1 to avoid problemshttp://blogs.msdn.com/gregmcb/archive/2008/03/03/apply-64-bit-fix-before-applying-sp1-to-avoid-problems.aspxhttp://support.microsoft.com/kb/946517 - Fix to correct 6482 Timer job Heap Corruption Issue on 64 bit system After applying SP1 the accounts on the WFE OSearch DCOM object permissions were removed. This was most likely caused by a failure in the OWSTimeren-USCommunityServer 2.1 SP1 (Build: 61025.2)