Created attachment 439663 [details]
log from LIBGUESTFS_TRACE=1

Description of problem:
It happens on Win2k3 with all hypervisors(Xen,KVM and ESX). Even the Win2k3-64bit guest with the size of 10G. 

In Win2k3 guest:
1. virtio drivers have copied to /windows/drivers/virtio
2. the value in DevicePath from registry is  %SystemRoot%\inf;%SystemRoot%\Drivers/VirtIO 


Version-Release number of selected component (if applicable):
virt-v2v-0.6.2-3.el6.x86_64
libguestfs-winsupport-1.0-5.el6.x86_64
libguestfs-1.2.7-1.23.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1.convert Win2k3 sp2 guests
  
Actual results:
V2V fails to install virtio_net and virtio_blk to Win2k3(32bit and 64bit) 

Expected results:
install virtio_net and virtio_blk to Win2k3(32bit and 64bit)  successfully.

Additional info:
win2k3-64bit guest's log from virt-inspector 
$VAR1 = '/dev/sda1';
$VAR2 = {
          'arch' => 'x86_64',
          'apps' => [],
          'os' => 'windows',
          'major_version' => '5',
          'root_device' => '/dev/sda1',
          'filesystems' => {
                             '/dev/sda1' => {
                                              'arch' => 'x86_64',
                                              'windows_registered_owner' => 'rhqe',
                                              'content' => 'windows-root',
                                              'is_root' => 1,
                                              'windows_current_type' => 'Uniprocessor Free',
                                              'windows_system_hive' => '/WINDOWS/system32/config/system',
                                              'os_minor_version' => '2',
                                              'fsos' => 'windows',
                                              'systemroot' => '/WINDOWS',
                                              'windows_software_hive' => '/WINDOWS/system32/config/software',
                                              'windows_software_type' => 'SYSTEM',
                                              'windows_registered_organization' => 'REDHAT',
                                              'windows_current_build' => '1.511.1 () (Obsolete data - do not use)',
                                              'is_mountable' => 1,
                                              'os_major_version' => '5',
                                              'boot_ini' => '/boot.ini',
                                              'fstype' => 'ntfs',
                                              'product_name' => 'Microsoft Windows Server 2003'
                                            }
                           },
          'root' => $VAR2->{'filesystems'}{'/dev/sda1'},
          'minor_version' => '2',
          'mounts' => {
                        '/' => '/dev/sda1'
                      },
          'product_name' => 'Microsoft Windows Server 2003'
        };