Thanks Waaronb,
SBS2011 is on drive C. The second server with mission critical application on seperate raid 1 drive.
Hyper V is the host and absolutely nothing else is loaded on the machine.
When looking at the core usage on the virtual machines, they seem normal. The core running at 100% is the first core on the physical machine. I just wonder if this can be to do with the high page faults; could the machine be thrashing?
Thanks