This could be indicative of a problem in Windows performance monitor counters database. To repair this database do the following:
Click Start, type cmd right click cmd.exe, and select Run as administrator.
At the prompt, type lodctr /r and press ENTER. This will repair the pointers (those are stored in the registry).
Info: Successfully rebuilt performance counter setting from system backup store
NOTE, still having issues? Using "lodctr /r" may cause the .Net Framework performance counters to be missing in the list of available performance counters in Windows. Should this happen, repeat the steps found in section "Reinstall any custom .NET Framework assembly performance counters" of the KB-article. Here is the KB-article link. http://support.microsoft.com/kb/300956