'\MSOLAP$POWERPIVOT:Memory\Memory Limit High KB' performance counter could not be found

I had problems in doing a data refresh for PowerPivot sheets. In the ULS logs I was getting the following error

System.ServiceModel.FaultException`1[[System.ServiceModel.ExceptionDetail, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken= ]]: The '\MSOLAP$POWERPIVOT:Memory\Memory Limit High KB' performance counter could not be found.  System error - Server stack trace:  

I checked the PerfMon and found that the MSOLAP counters were missing.

I tried the load the counters given in this link. But I got an error saying that the counters are already present. After lot of digging and discussion with Microsoft found that I need to set the following in the registry. For 64 bit Go to->  HKLM \ System \ CurrentControlSet \ Services\MSOLAP$POWERPIVOT\ Performance and set Disable Performance Counters = 2 .

For 32 bit installations set it to 0.

Restart the server that hosts the power-pivot and you should be able to see the  MSOLAP performance counters in PerfMon and PowerPivot data refresh should work.

In the first instance I do not know how the performance counters were disabled. Can anyone throw light on this?