Mountain lion freezes during installation with 34 mins remaining

Hi all,
My upgrade to mountain lion (from lion) freezes almost immediately when it hits the 'install os x' screen. It shows only the smallest possible progress in the progress bar and time remaining is stuck at 'about 34 minutes'. My mbp bought in 2010 rumbles as if doing something, but has been making this sound with no apparent progress for over 45 mins now. How do i get out of this freeze situation?
Thanks!
Mark

Follow-up:
Ok, after more than an hour 'time remaining' changed to 33 minutes and 15 mins later to 28. The progress bar also started showing progress. Strangely enough it then changed back to 31 mins and less progress (but at least it started showing something). Just hope this is not an indication the the new os has lost the ability to tell time...

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