Several days ago, I started Performance Monitor, and I tripped the following error: Unable to add these counters: \Memory\Available MBytes \Memory\% Committed Bytes In Use \Memory\Cache Faults/sec \Memory\Cache Faults/sec \PhysicalDisk(*)\%Idle Time \PhysicalDisk(*)\Avg. Disk Queue Length \Network Interface(*)\Bytes Total/sec Looking around, I found and followed this article. The Solution I fixed the problem by executing the following command from an administrative Command Prompt window: lodctr /r … Continue reading HOWTO fix Performance Monitor ‘unable to add counter’ errors »