I'm running Xen on Fedora Core 6 with a 64bit AMD Sempron 3000+. I was hoping to get a Windows Server 2003 DC (domain controller) running this way instead of dual booting and using VMWare under XP. But despite the Xen enabled kernel booting up fine I only have the option to paravirtualize. From what I gather from wikipedia, I guess I need hardware virtualization. Or does Vista's kernel support paravirtualization now? Anyway, the Xen kernel messes up CPU frequency scaling too. So if I'm not going to be able to get Windows running in a VM guess I'll go back to the regular/non-Xen kernel.

Here's a screenshot that might better illustrate my problem:
http://4crito.com/screenshots/xen.png