SCVMM 2008 R2 Forcefully Remove Virtual Server Host From SCVMM Console
You may have an issue where you are struggling to remove a hyper-v host for a reason such as you, re-installed the OS on the machine and not removing the SCVMM agent first and when you go to remove it from the SCVMM console it just fails as it can’t communicate with the hyper-v host.
To Forcefully remove the Hyper-V Host you first have to open SCVMM’s Powershell.

Then run the following command “Get-vmhost changetoservername | remove-vmhost –force” .
The Hyper-V host will now be gone.
Daniel Davies

