I use 2 operating systems in my laptop.
I am using Windows 7 and Ubuntu 12.04
When I use Ubuntu, it often makes my laptop overheat and sometimes turn off suddenly.
Why does it happen?
Is it because of damage to my hardware or because I am using 2 OSs?

My laptop's specifications

```
Processor    : Intel(R)Core(TM)2 Duo CPU T6600 @ 2.20Ghz
RAM      : 2 GB
System type  : 64-bit Operating System

```