Joseph L. Casale wrote:
AFAIK you can only run any windows version in paravirtualized mode only in vmware server, not in Xen or KVM which are the virtualization technologies CentOS supports.
No. Vmware is no different than Xen or any other in this respect, they also don't have access to the source and therefore cannot provide a modified version of the OS.
But Vmware and I think Virtualbox are capable of running unmodified Windows guests even on CPU's lacking the vt capability. I don't think Xen can do that.