Using Boot to VHD is very similar to dual-booting your machine, except that you do not have to partition your hard drive. It also has performance benefits over using a Hyper-V server for presentations.
Pre-Requisites
bcdedit /copy {default} /d “Demo-NameOfDemo”

bcdedit /set <GUID> device vhd=[D:]\VM-DEV-SharePoint_2010_Public_Beta.vhd
D: is the drive the VHD is located and VM-DEV-SharePoint_2010_Public_Beta.vhd is the location of your VHD file. Make sure you update with the GUID you got in the previous step.
bcdedit /set <GUID> detecthal on
