No Reboot just hangs

I'm imaging via pxe. The image is loaded without a problem. No errors.
I close out by doing *ALT+X*. When I get to the # prompt, I type:

# REBOOT

The PC boots up and then hangs at the following:

THE ZENWORKS IMAGING AGENT IS FINALIZING... (YADA YADA YADA...)

PLEASE WAIT TO LOG IN TO OR SHUT DOWN THIS WORKSTATION... ETC.. ETC...

The system never reboots and the message never disappears.

When I manually shut down and restart the machine, I get the same
message about the Zenworks Imaging Agent, and then I get the following
Windows error msg:

Windows - Delayed Write Failed
WINDOWS WAS UNABLE TO SAVE ALL THE DATA FOR THE FILE
C:\WINDOWS\SYSTEM32\DLLCACHE\MSDAPRSR.DLL. THE DATA HAS BEEN LOST.
THIS ERROR MAY BE CAUSED BY A FAILURE OF YOUR COMPUTER HARDWARE OR
NETWORK CONNECTION. PLEASE TRY TO SAVE THIS FILE ELSEWHERE.

Some of the machines that I've imaged did just fine, and some are
giving me this headache... =^)

How do I fix this problem?


--
Tycopolis