Does Xen support Microsoft Windows?
The paravirtualized approach we use to get such high performance has not been usable directly for Windows to date. However Xen 3.0 added Intel VT-x support to enable the running of unmodified guest operating systems, including Windows XP & 2003 Server, using hardware virtualization technology. Xen 3.0.2 and later support AMD Pacifica technology as well. Check to see if your CPU is among the list of HVM Compatible Processors, and if your motherboard is among the list of HVM Compatible Motherboards.