Well, the problem is again my notebook, which is 'compaq nx9010' and of which the temperature is rising the limit.
I always wondered my notebook is too hot when performing a task which takes a lot of RAM memory. So since a month ago, I installed 'Speed Fan' and have monitored the temperature of my notebook. When it performs a difficult task which takes a lot of RAM memory as mentioned before, the hard disk temperature rises above 50 c which is not recommended. Even when it performs a simple task just like typing in an MS word, it's never cooled down under 40 c. I have even turned on the AC with its wind direction towards the notebook, it didn't help much.
Please help me.