If you are trying to test out Window Server 2012 or Windows 8 by running it on a Windows Server 2008 R2 Hyper-V system then you may well see your guest machines lockup on a frequent basis. I’ve seen this myself, but only after I started to do backups on the Hyper-V host on a regular basis. To resolve this problem, you need to download this hotfix and install it on the Windows Server 2008 R2 Platform.
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