Jetstress will not load performance counters after applying a service pack or hotfix

After applying a hotfix or service pack to a test Exchange server, the Jetstress program will no longer start and fails when loading performance counters.
Errors include "Process failed to load database performance counters. Please make sure that all database performance counters are working properly with System Monitor."
Clicking the "Fix Errors" button does not solve the issue.

Jetstress relies on�four files to function correctly:�ESE.DLL,�ESEPERF.DLL,�ESEPERF.INI and�ESEPERF.HXX. If the versions of these files in the Jetstress install directory do not match the versions installed in the Exchange bin directory, you will see the errors described above.

�

Per�the Jetstress documentation: "In a command shell window, enter the command �unlodctr ESE� and press Enter. This will unregister the ESE Database performance counters".
Doing�so should fix this issue, however, Microsoft recommends that you test using the same version of the ese.dll as will be used in production. To meet this requirement, copy the updated versions of the�four required dll files from the Exchange bin directory into the Jetstress install directory before restarting Jetstress again so that it can reload the performance counters using the correct�ESE library files.

Do not use Jetstress in a production environment.
Installing Exchange is not a requirement to use Jetstress. See the Jetstress documentation for more information.
http://www.microsoft.com/downloads/details.aspx?FamilyId=94B9810B-670E-433A-B5EF-B47054595E9C&displaylang=en
�
�

Microsoft corporation and/or its respective suppliers make no representations about the suitability, reliability, or accuracy of the information and related graphics contained herein. All such information and related graphics are provided "as is" without warranty of any kind. Microsoft and/or its respective suppliers hereby disclaim all warranties and conditions with regard to this information and related graphics, including all implied warranties and conditions of merchantability, fitness for a particular purpose, workmanlike effort, title and non-infringement. You specifically agree that in no event shall Microsoft and/or its suppliers be liable for any direct, indirect, punitive, incidental, special, consequential damages or any damages whatsoever including, without limitation, damages for loss of use, data or profits, arising out of or in any way connected with the use of or inability to use the information and related graphics contained herein, whether based on contract, tort, negligence, strict liability or otherwise, even if Microsoft or any of its suppliers has been advised of the possibility of damages.