Problem All was working well then on the same day we got an issue with two servers where the performance counters werent right when you opened PerfMon. The image below shows what you could see. Normally you get a list of the names of all of the performance objects and counters belonging to each. In this case we just saw a list of numbers. One one server it possibly had not been used before, but the other was our build server which had been working fine until one evening when a number of builds started ......