how to up Windows Server 2008 R2 SP1 created VM with Windows 8.1 hyper-v manager

Hi

I have VM that created with Windows Server2008 R2 SP1. This was up without a problem with the windows 8 hyper-v manager. I have recently upgraded my OS with 8.1. Now I have tried to import this VM but itthrowme following message.

This is a real pain when there is no way of doing this. Any help greatly appreciated.

Regards

Radika