Try typing this at a command prompt and reboot
diskperf -y
DISKPERF [-Y[D|V] | -N[D|V]] [\\computername]
-Y Sets the system to start all disk performance counters when the system is restarted.
-YD Enables the disk performance counters for physical drives when the system is restarted.
-YV Enables the disk performance counters for logical drives or storage volumes when the system is restarted.
-N Sets the system to disable all disk performance counters when the system is restarted.
-ND Disables the disk performance counters for physical drives.
-NV Disables the disk performance counters for logical drives.
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