I'm afraid you can't. Windows 7's backup tool creates VHD files, but this VHD file is not the same as that used by Windows Virtual PC. See this page, and note at the bottom of this quotation:
http://kb.acronis.com/cont
Introduction
Acronis True Image 2010 backup (TIB) files can be converted to Windows backup VHD files. There are several reasons why Acronis recommends doing this:
You can boot your machine from the converted VHD file to test if it is not corrupt and works fine;
You can boot from the converted VHD for testing purposes. For example, to install a new application and see if it runs fine;
You can keep the converted VHD file for emergency situations. For example, if your machine crashes and you need to get it up and running in no time, you can just boot from the VHD file.
In Windows 7, the VHD file can be mounted as an additional drive.
(!) If you are going to boot from the converted VHD file, there should either Windows 7 Ultimate or Windows 7 Enterprise Edition in the file.
(!) If you are going to mount the VHD file in Windows 7, there can be non-system Windows partitions.
(!) Any changes you make to the booted or mounted VHD file are saved to it. If you boot from the VHD file and make changes to the data that was not backed up (e.g. delete a file from drive that was not backed up), these changes will affect your live system.
(!) File backup (as opposed to partition backup) cannot be converted to VHD.
(!) You can only boot the same machine the backup of which was converted to VHD. Booting other machines from the same VHD files will fail.
(!) You cannot run the converted VHD file as a virtual machine.
Also, see this page:
http://forum.acronis.com/f
4562: MS Virtual PC Does Not Boot from Converted VHD Disk
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by: FirebarPosted on 2009-10-27 at 13:51:23ID: 25677308
Sure.
Just import the .vhd file into the Virtual PC console.
File \ New Virtual Machine Wizard \ Add an existing virtual machine \
According to this Virtual PC does support VHD file formats.
http://technet.microsoft.c
Why not use Virtualbox?