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At the graphical stage, after copying files and at the beginning of DCOM installation, the guest system restarts. On version 5.0 (or 5.1), enabling video recording helped. Now I have not found a solution. Host -- Server 2012 R2.

I'm not so sure that I understand the problem here, it's a little fuzzy from your description (you're in Twitter-mode). Can you describe the problem more thoroughly, and the step-by-step instructions to reproduce the issue?