Managed computer receives image task, but it disappears quickly.

If I send a Reboot to PXE task to a managed computer, it goes into our x64 WinPE environment as it should.  I then have a deploy image task sent to the machine using rdeploy.  On the managed computer, the rdeploy prompt shows for two seconds at best, and disappears.  Checking the console then shows that the task fails.  This is a sysprepped image of Windows 7 x64.

However, if I run another deploy image task with an image of Windows XP, the image starts and runs fine. 

What could be the difference?