Durin Mountain lion install, Mac loops endlesslu as pert of restart

During Mountain Lion install, the Mac loops forever on restart.  Download seemed to go ok, albeit very slow, bt now it is trying to restart continuously.  What can I do from here?  Thank you.

I am assuming that it was Lion Recovery that allowed me to do that.
Yes.
I do have antivirus  installed, so I guess my next step would be to disable that and turn off the firewall, then try the install again.  That will have to happen another day, as I have to work on other things. Thank you!
Ok. Keep us posted ...  you're welcome

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