My laptop heats up and shuts down

I bought my laptop in US and am using the same adapter. Maybe this is the reason, but I'm seriosly worried as my laptop after an hour of use becomes very hot and shuts down. I don't know what the problem really is, but lately, it seems to shut down even quickly.
I thought the fans might not be working, but they were when I looked at them. It's happened from the brand new, and I've used it like that for six months now. But since the problem's become worst, I thought of asking for help here. Is there anything I can do?
Thank you.

HI Shalav,
Your notebook will most likely be using a 'universal' mains adapter so it will work perfectly well in the UK as well as the US.
Your problem is most likely to be a build up of dust in the CPU heat-sink which will reduce its effectiveness to the point where the build up of heat causes the thermal protection circuitry to opertae and shut off power.
Clean out any accumulation of dust and also make sure that there is sufficient air able to circulate through the cooling system. Leave plenty of spoace around and under your notebook.
regards,

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