Fan speed increases and windows 7 freeze on my Satellite A200

I am using Toshiba Satellite A200-24A (PSAE3E) from 3 years now. It came pre-installed with Vista. Last year i switched to Winows 7 Ultimate. Everything was fine.
4 months ago, i switched to Windows 7 Enterprise N. Hated to see no Windows Media Player in it. Now the problem is, during online video streaming (not always the case), my fan speed inceases, so do its sound, and my hard drive gets real busy. 10 seconds later, my window is freezed. Actually, its not responding due to excessive hard drive usage.
I read many articles over the internet, lots of toshiba users are facing the same problem when using Windows 7. But, i couldn't find any solution to it.
This problem started 3 months ago, then for sometimes, it stopped itself. now, it started again 3 weeks ago. If anyone can help me regarding this issue, i will me more than grateful.
Here are my specs:
Windows 7 Enterprise N. Service Pace 1
1.73 Dual core
Ram 3GB
Hard Disk partitions 75 GB + 75 GB

I presume CPU usage goes to 100% and result is freezing. Can you identify background process that can be responsible for this?
> I read many articles over the internet, lots of toshiba users are facing the same problem when using Windows 7. But, i couldn't find any solution to it.
Your opinion is too general. Lot of Toshiba users have a lot of different problems with Windows7. My notebook was also delivered with Vista and since one year I use Win7 32bit and everything works perfectly.
> This problem started 3 months ago...
This make the whole situation more complicated. What have you done 3 months ago? Have you changed some settings, installed some additional software that can be responsible for this?
Unfortunately it is not easy to help in this situation.

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