Host server member of domain running in local hyper V

I have a server running server 2008 with the Hyper-V role.
This server is hosting a virtual server with SBS2008.
Someone - NOT ME - made the host server a member of the domain of the SBS.
This means that when you restart this host server, you are not able to login in BEFORE the virtual SBS is fully online cause its the domain controller!

This is not a very smart configuration and I wan't to fix this by disjoining the host from the SBS domain.
If I do this I will log in to a brand new profile on the host server.
Could this be a potential problem?
I mean could I somehow loose the hyper v manager by changing the profile?