When using the Imaging Wizard a vDisk is created, then the machine is rebooted to load the vDisk image for the local disk image to be copied to. This happens automatically on login after the reboot.

When the imaging starts, the following error is reported:

P2PVS
vDisk is not available. Please check your network PXE boot configuration and restart Imaging Wizard.
OK

PXE is configured and working, as other vDisk images can be started.

This is due to non-present network adapters being bound before present adapters.

To remove non-present devices run the following commands in a command prompt:

set devmgr_show_nonpresent_devices=1
devmgmt.msc

From Device Manager:
- Select View | Show hidden devices
- Expand Network adapters
- Right click on any greyed out NICs and select Uninstall from the context menu

Error: vDisk is not available. Please check your network PXE boot Configuration and restart imaging wizard.
http://support.citrix.com/article/CTX133272