UNIMPLEMENTED: cm: NtUnloadKey is missing

Due to NtUnloadKey being unimplemented syssetup (install.c:889) is forced to use a very ugly hack. Part of the second stage setup runs under the administrator account. Which in turn makes .inf setup files trying to add information to HCKU create the keys in the wrong place. To make things even worse the administrator account is created in the middle of the setup process not at the end so some default settings added to HCKU may not be present when the account is created