Portege R700 - freeze & fan

Hi,
I've a two day old Portege R700 and it has developed a freeze and fan issue. Actually it kicked in on day one.
Basically the screen freezes and the cooling fan kicks into gear and nothing else responds until you do the off & on again thing. Its happened a couple of times now on two different days.
Any ideas?
Send it back?
Download an amazing bit of software I currently know nothing about?
Persevere on the toshiba website until I find out how to contact Toshiba directly rather than you good folk?
Ignore it and hope it goes away?
Any advice welcome. Though please make it as basic as possible as I'm a bit of a novice when it comes to the technical stuff.
R
(Just in case you're thinking about overheating, based in the UK and it isn't a hot day and there is free air circulation around the laptop. The second freeze happened after only ~2h30 of use.)

Hi,
Apologies for the lack of details & thanks for taking the time to respond.
OS:
Windows 7 32 bit.
CONFIG:
As it originally was, I have made no modifications other than loading any updates when I first switched the laptop on.
SOFTWARE:
Office professional 2010
itunes
Mendeley (An academic paper management system)
internet explorer 8
(+any prepackaged stuff that came with the laptop that I haven't opened or explored.)
McAfee antivirus
POWER SUPPLY:
So far I've only run the laptop off the AC power supply. So I do not know if it will also happen on battery power.
On a positive note, it hasn't happened for the last 3 hours. I will however hunt out the nearest authorized service and ask a few questions.
Thanks.

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Message was edited by: SSDperformance change three to four

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