After doing a little homework, I recently bought a cheapo £500 (Philips branded) laptop from PC World UK (PC-City in other countries). According to Intel, the Core 2 Duo CPU that was in it did have the Hyper-V instructions, but I did not know whether the BIOS would support Hyper-V. The laptop was bough purely in the hope of running Hyper-V
Using a Dell Win2008 64 bit DVD I attempted an install of Win2008, to my delight it worked - 60 day evaluation, (which can be extended twice before it falls over!). I had to do a fair bit of fannying about looking for the 64 bit drivers (I didn't think it was worth asking for advice in the shop - the laptop a Philips badged Advent
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Anyway, I installed the RTM version of Hyper-V, downloading it on the day of release! Again it worked (except the WiFi card). I connected a WinXP VHD from a Virtual PC / Virtual Server 2005, I use for testing. At first I had difficulty getting the new child Video and Network card running correctly, then XP insisted on re-activation - which worked over the Internet.
I have spent a fair bit of time screwing around with the system, and it runs quite well on 2 GM RAM. I still really dislike the mess and bloat of Win2008 / Vista, and am not convinsed it's the future - but my experience has been very positive. One thing that also pleased me was I was able to shove Win2008 / HyperV on the same 25 GB C: partition as WinXP and Win2003 installations.
These O/S's were installed to c:\winXP and C:\Win2k3 respectively, the "document and settings" folders moved to the windows (profiles) folders as WinNT4.0. (using an answer file) C:\Program Files were frigged to c:\ProgFXP\ and C:\ProgF2k3\ using Resplendant Registrar to edit the registry. The real tricky bit was going back to the old Windows 2k3 bootloader (NTLDR, NTDetect.com and boot.ini). With a sneaky boot sector rip off and edit, and the help of Norton Ghost / Barts bebuilder boot USB stick (a few uses actually!) I can now sucessfully boot to any of the three O/S's, leaving a blank D: drive for all my VHD's and CD /DVD ISO images.
All in all a worthwhile investment of £500. If anyone else is interested I'm happy to dig out the model number (if it is still sold)