After weeks of testing and experimenting, I no longer get any BSOD from the system, but the crash still persists. However, I think I have narrowed down the scope of this symptom.
The crash would randomly occur when a Flash-based content is running, regardless of web browser (In this case, Internet Explorer, Firefox and Google Chrome) this includes, but not limited to, YouTube videos, SWF movie files and games on Facebook.
I have tried uninstalling and reinstalling Flash plugins, but it doesn't seem to help.
I've searched the web and found others with almost identical issue as well, but without the useful remedy.
I'm starting to wonder if the graphics driver has a serious issue with Flash GPU acceleration...Any ideas, please?