Very interesting subject, in fact. But no, XEN has no support for Windows
http://wiki.xensource.com/xenwiki/Xe...0793ad01769b92
Quote - "Unfortunately we do not currently support Windows; the paravirtualized approach we use to get such high performance has not been usable directly for Windows to date. However recently announced hardware support from Intel and AMD will allow us to transparently support Windows XP & 2003 Server in the near future. We are working on this and intend to have support available by the time the new processors are available."