Thanks for the reply, Mark. You pointed me in the right direction to solve my issue. I compared the perf*.dll files on the server that was giving me problems with the files on a server that was working. All of the DLLs had the same version number. I launched perfmon on both servers. I noticed that perfmon did not display any counter data on the problem server. My research led me to this article: <a href="http://support.microsoft.com/kb/152513/en-us"> http://support.microsoft.com/kb/152513/en-us</a> I ran regedit and noticed that the keys located at HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Perflib\009 were different between the servers. I copied the keys from the good server to the bad one. Perfmon.exe started running normally as soon as it was relaunched. The NC_Net service started reporting accurate data shortly thereafter. Once again, thank you very much for the reply. I would not have been able to figure it out without you. I hope my experiences can help someone else in the same situation. Jeremy Farrar Systems Intergrator Adapt of America