Sysprep is already running

[jack0w]

Trying to update a number of our images and roll them out over the Easter break, however I've come up against a problem that I've not been able to resolve or even find any information about online!

 

Sysprep runs with the following command line switches '-reseal -mini -quiet' however after it runs through the process (you see the hourglass turning as normal) it will pop up with a message saying that 'Sysprep is already running' at the point it would normally reboot. If you reboot the computer manually after this message appears minisetup doesn't run either.

 

I've tried watching task manager but can only ever see one instance of sysprep running.

 

Does anyone have any bright ideas? At a loss on this one