Need to cancel drive extension in Hyper V 2008 R2

I need help asap. I started a hard drive expansion in Hyper-V 2008 R2 and accidentally set it for the wrong size. It is taking forever to complete. Is there anyway for me to stop it? I hit the cancel option and got a message stating the task cannot be canceled. It is still expanding.
Gelly77Asked:
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Gelly77Author Commented:
A reboot solved it. When it came back up the task did not start back ip.

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