After another late night of fruitless trying, I have to ask: has anyone managed to get Winows XP x64 to work (including network) as guest OS in Hyper-V?
Last night I tried for 3rd time (less than 3 hours before that I deleted the OS VHD from my HDD :-)), this time using a “Legacy Network Adapter”. The result was consistent with previous attempts (failure). The x64 display drivers seems to work, but others (most importantly, the NIC driver) don’t and after installation Device Manager shows a yellow exclamation mark. Maybe I should just trust the docs – not supported and can’t work.
Out of despair I previously tried the same guest OS on VirtualBox and VMware Workstation 6.x – neither support x64 guests. And this was on Windows Server 2008 SE x64 on which Hyper-V RC0 does support x64 operating systems. I ran that VMware test proggie to make sure and indeed my fairly new Intel Core Duo processor obviously won’t do. Luckily I’ve no this problem with Hyper-V.
Update (2008/09/28): In the meantime Hyper-V RTM (with Windows XP x64 SP2 support) shipped, but for some reason my OS didn’t get the update (http://support.microsoft.com/kb/95005) so I just wasted a day on troubleshooting this stuff… Wonderful.