Windows 2008 R2 as Active Directory: The driver detected that the device \Device\Harddisk0\DR0 has its write cache enabled. Data corruption may occur.
Verify that your C drive was plugged on the first SATA (0) interface on your motherboard.
It could be a problem if your Active Directory server go down for exemple after electrical crash ...
So after Server boot:
The driver disabled the write cache on device \Device\Harddisk0\DR0.