I had a strange problem today. I wanted to take a peek at the CLR memory performance counters but I couldn’t find them. After some searching it turns out I needed to set the following registery key to 0;
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\.NETFramework\Performance\Disable Performance Counters
IT Bytes 
Was really helpful. Thanks,
Thx, helped us a lot!
Make sure you reboot the box after that change for anybody following this. This in fact works.