Re: PC and freezing temperatures
There could be some problems with the display. LCDs don't work very well in cold temperatures. Battery life is frequently a lot less in cold conditions, too. Given the very tight tolerances, cold might not be good for hard drives, either.
Every component in the system has a thermal rating, so I'd recommend you look in the manual. According to this source, most manufacturers recommend a temperature range from 50 to 95 degrees F (10 to 35 degrees C).