NAV 2012 high usage and high CPU temp.

I am about ready to enter my key for NAV2012.

Friend emailed me stating that  he noticed that when he keyed his NAV 2012  from his trial copy, his CPU temp went up to 48-50 degrees on his quad 3.8Hz where it usually idles about 30-32 degrees.  Also his usage jumped to 13% rather than the normal 1-2%.

He uninstalled 2012 and  loaded 2011, same results; uninstalled 2011 and re-loaded 2010 and all was fine with temp back to 32 degrees and 1% usage. 

Is this a known problem or should I go to back to 2010? .