Not sure what you mean, installer as Admin.
I am Admin on my Win 7 system and I installed the VMWorkstation, no problems.
I create a new VM pointing the Installation to the ISO file, VMWorkstation recognises it as Ubuntu 12.10 and starts an easy install. But it hangs during install.
I can't as far as I know, install Ubuntu as Admin...its a Bare VM...
Can you clarify?