I use the Jetstress Tool (core engine version 14.01.0225.017) with the ese version 14.01.0270.001 on an german Windows 2008 R2 Server. After the installation i can start the tool an load the performance conuters. One day later the tool didn´t load the countes. -- Jetstress found the following faulty logical disk performance counters: G:, Harddisk Volume1, D: and C:. Ensure that all logical disk performance counters are working correctly with System Monitor. Error The performance counter with the category name logical Disk not fount: Indicatorname: % Disk Time

Hi, 1. Turn off the anti-virus program. 2. Restart Performance logs & Alerts service and test to see if the issue persists.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT

Check the field guide for Jetstress, it's very good! http://msexchangeteam.com/archive/2010/11/15/456926.aspxJonas Andersson | Microsoft Community Contributor Award 2011 | MCITP: EMA 2007/2010 | Blog: http://www.testlabs.se/blog | Follow me on twitter: jonand82