There is a bug in the K1000 5.3 agent that causes the "Unexpected Shutdown" dialog box to pop up after a restart when the agent service is running.  It's currently scheduled to be resolved in version 5.4 of the agent.

As a work-around:

1. You can stop the AMP agent service before rebooting manually. This would be done through services or through the command line:

net stop ampagent

2. You can create a batch file and put it on the desktop that stops the ampagent and forces a restart.

This works, but you have to run as administrator (e.g. right-click on it and select run as) otherwise you don't have rights to services. You could also include administrator credentials in the batch if you wish.

Batch file contents:

start /wait net stop ampagent
shutdown -r